Class DataFrame (0.2.0)

Version 0.2.0

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DataFrame(
    data=None,
    index: vendored_pandas_typing.Axes | None = None,
    columns: vendored_pandas_typing.Axes | None = None,
    dtype: typing.Optional[
        bigframes.dtypes.DtypeString | bigframes.dtypes.Dtype
    ] = None,
    copy: typing.Optional[bool] = None,
    *,
    session: typing.Optional[bigframes.session.Session] = None
)

Two-dimensional, size-mutable, potentially heterogeneous tabular data.

Data structure also contains labeled axes (rows and columns). Arithmetic operations align on both row and column labels. Can be thought of as a dict-like container for Series objects. The primary pandas data structure.

Properties

axes

Return a list representing the axes of the DataFrame.

It has the row axis labels and column axis labels as the only members. They are returned in that order.

Examples

df = pd.DataFrame({'col1': [1, 2], 'col2': [3, 4]})
df.axes
[RangeIndex(start=0, stop=2, step=1), Index(['col1', 'col2'],
dtype='object')]

columns

The column labels of the DataFrame.

dtypes

Return the dtypes in the DataFrame.

This returns a Series with the data type of each column. The result's index is the original DataFrame's columns. Columns with mixed types aren't supported yet in BigQuery DataFrames.

empty

Indicates whether Series/DataFrame is empty.

True if Series/DataFrame is entirely empty (no items), meaning any of the axes are of length 0.

Note: If Series/DataFrame contains only NA values, it is still not considered empty.

Returns
Type	Description
bool	If Series/DataFrame is empty, return True, if not return False.

iloc

Purely integer-location based indexing for selection by position.

.iloc[] is primarily integer position based (from 0 to length-1 of the axis), but may also be used with a boolean array.

Allowed inputs are:

• Not supported yet An integer, e.g. 5.
• Not supported yet A list or array of integers, e.g. [4, 3, 0].
• A slice object with ints, e.g. 1:7.
• Not supported yet A boolean array.
• Not supported yet A callable function with one argument (the calling Series or DataFrame) that returns valid output for indexing (one of the above). This is useful in method chains, when you don't have a reference to the calling object, but would like to base your selection on some value.
• Not supported yet A tuple of row and column indexes. The tuple elements consist of one of the above inputs, e.g. (0, 1).

.iloc will raise IndexError if a requested indexer is out-of-bounds, except slice indexers which allow out-of-bounds indexing (this conforms with python/numpy slice semantics).

index

The index (row labels) of the DataFrame.

The index of a DataFrame is a series of labels that identify each row. The labels can be integers, strings, or any other hashable type. The index is used for label-based access and alignment, and can be accessed or modified using this attribute.

loc

Access a group of rows and columns by label(s) or a boolean array.

.loc[] is primarily label based, but may also be used with a boolean array.

Allowed inputs are:

• A single label, e.g. 5 or 'a', (note that 5 is interpreted as a label of the index, and never as an integer position along the index).
• A list of labels, e.g. ['a', 'b', 'c'].
• A boolean series of the same length as the axis being sliced, e.g. [True, False, True].
• An alignable Index. The index of the returned selection will be the input.
• Not supported yet An alignable boolean Series. The index of the key will be aligned before masking.
• Not supported yet A slice object with labels, e.g. 'a':'f'. Note: contrary to usual python slices, both the start and the stop are included.
• Not supported yet A callable function with one argument (the calling Series or DataFrame) that returns valid output for indexing (one of the above).

Exceptions
Type	Description
NotImplementError	if the inputs are not supported.

ndim

Return an int representing the number of axes / array dimensions.

Returns
Type	Description
int	Return 1 if Series. Otherwise return 2 if DataFrame.

query_job

BigQuery job metadata for the most recent query.

shape

Return a tuple representing the dimensionality of the DataFrame.

size

Return an int representing the number of elements in this object.

Returns
Type	Description
int	Return the number of rows if Series. Otherwise return the number of rows times number of columns if DataFrame.

sql

Compiles this DataFrame's expression tree to SQL.

values

Return the values of DataFrame in the form of a NumPy array.

Methods

__array_ufunc__

__array_ufunc__(
    ufunc: numpy.ufunc, method: str, *inputs, **kwargs
) -> bigframes.dataframe.DataFrame

Used to support numpy ufuncs. See: https://numpy.org/doc/stable/reference/ufuncs.html

__getitem__

__getitem__(
    key: typing.Union[
        typing.Hashable,
        typing.Sequence[typing.Hashable],
        pandas.core.indexes.base.Index,
        bigframes.series.Series,
    ]
)

Gets the specified column(s) from the DataFrame.

__repr__

__repr__() -> str

Converts a DataFrame to a string. Calls compute.

Only represents the first <xref uid="bigframes.options">bigframes.options</xref>.display.max_rows.

__setitem__

__setitem__(
    key: str, value: typing.Union[bigframes.series.Series, int, float, typing.Callable]
)

Modify or insert a column into the DataFrame.

Note: This does not modify the original table the DataFrame was derived from.

abs

abs() -> bigframes.dataframe.DataFrame

Return a Series/DataFrame with absolute numeric value of each element.

This function only applies to elements that are all numeric.

add

add(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get addition of DataFrame and other, element-wise (binary operator +).

Equivalent to dataframe + other. With reverse version, radd.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

add_prefix

add_prefix(prefix: str, axis: int | str | None = None) -> DataFrame

Prefix labels with string prefix.

For Series, the row labels are prefixed. For DataFrame, the column labels are prefixed.

Parameters
Name	Description
prefix	str The string to add before each label.
axis	int or str or None, default None {{0 or 'index', 1 or 'columns', None}}, default None. Axis to add prefix on.

add_suffix

add_suffix(suffix: str, axis: int | str | None = None) -> DataFrame

Suffix labels with string suffix.

For Series, the row labels are suffixed. For DataFrame, the column labels are suffixed.

agg

agg(func: str | typing.Sequence[str]) -> DataFrame | bigframes.series.Series

Aggregate using one or more operations over the specified axis.

Parameter
Name	Description
func	function Function to use for aggregating the data. Accepted combinations are: string function name, list of function names, e.g. ['sum', 'mean'].

Returns
Type	Description
DataFrame or bigframes.series.Series	Aggregated results.

aggregate

aggregate(func: str | typing.Sequence[str]) -> DataFrame | bigframes.series.Series

Aggregate using one or more operations over the specified axis.

Parameter
Name	Description
func	function Function to use for aggregating the data. Accepted combinations are: string function name, list of function names, e.g. ['sum', 'mean'].

Returns
Type	Description
DataFrame or bigframes.series.Series	Aggregated results.

all

all(*, bool_only: bool = False) -> bigframes.series.Series

Return whether all elements are True, potentially over an axis.

Returns True unless there at least one element within a Series or along a DataFrame axis that is False or equivalent (e.g. zero or empty).

Parameter
Name	Description
bool_only	bool. default False Include only boolean columns.

Returns
Type	Description
bigframes.series.Series	Series if all elements are True.

any

any(*, bool_only: bool = False) -> bigframes.series.Series

Return whether any element is True, potentially over an axis.

Returns False unless there is at least one element within a series or along a Dataframe axis that is True or equivalent (e.g. non-zero or non-empty).

Parameter
Name	Description
bool_only	bool. default False Include only boolean columns.

applymap

applymap(
    func, na_action: typing.Optional[str] = None
) -> bigframes.dataframe.DataFrame

Apply a function to a Dataframe elementwise.

This method applies a function that accepts and returns a scalar to every element of a DataFrame.

Note: In pandas 2.1.0, DataFrame.applymap is deprecated and renamed to DataFrame.map.

Parameter
Name	Description
na_action	Optional[str], default None {None, 'ignore'}, default None. If ‘ignore’, propagate NaN values, without passing them to func.

Returns
Type	Description
bigframes.dataframe.DataFrame	Transformed DataFrame.

assign

assign(**kwargs) -> bigframes.dataframe.DataFrame

Assign new columns to a DataFrame.

Returns a new object with all original columns in addition to new ones. Existing columns that are re-assigned will be overwritten.

Note: Assigning multiple columns within the same assign is possible. Later items in '**kwargs' may refer to newly created or modified columns in 'df'; items are computed and assigned into 'df' in order.

Returns
Type	Description
bigframes.dataframe.DataFrame	A new DataFrame with the new columns in addition to all the existing columns.

astype

astype(
    dtype: typing.Union[
        typing.Literal[
            "boolean",
            "Float64",
            "Int64",
            "string",
            "string[pyarrow]",
            "timestamp[us, tz=UTC][pyarrow]",
            "timestamp[us][pyarrow]",
            "date32[day][pyarrow]",
            "time64[us][pyarrow]",
        ],
        pandas.core.arrays.boolean.BooleanDtype,
        pandas.core.arrays.floating.Float64Dtype,
        pandas.core.arrays.integer.Int64Dtype,
        pandas.core.arrays.string_.StringDtype,
        pandas.core.arrays.arrow.dtype.ArrowDtype,
    ]
) -> bigframes.dataframe.DataFrame

Cast a pandas object to a specified dtype dtype.

Parameter
Name	Description
dtype	str or pandas.ExtensionDtype A dtype supported by BigQuery DataFrame include 'boolean','Float64','Int64', 'string', 'tring[pyarrow]','timestamp[us, tz=UTC][pyarrow]', 'timestampus][pyarrow]','date32day][pyarrow]','time64us][pyarrow]' A pandas.ExtensionDtype include pandas.BooleanDtype(), pandas.Float64Dtype(), pandas.Int64Dtype(), pandas.StringDtype(storage="pyarrow"), pd.ArrowDtype(pa.date32()), pd.ArrowDtype(pa.time64("us")), pd.ArrowDtype(pa.timestamp("us")), pd.ArrowDtype(pa.timestamp("us", tz="UTC")).

copy

copy() -> bigframes.dataframe.DataFrame

Make a copy of this object's indices and data.

A new object will be created with a copy of the calling object's data and indices. Modifications to the data or indices of the copy will not be reflected in the original object.

count

count(*, numeric_only: bool = False) -> bigframes.series.Series

Count non-NA cells for each column or row.

The values None, NaN, NaT, and optionally numpy.inf (depending on pandas.options.mode.use_inf_as_na) are considered NA.

Parameter
Name	Description
numeric_only	bool, default False Include only float, int or boolean data.

Returns
Type	Description
bigframes.series.Series	For each column/row the number of non-NA/null entries. If level is specified returns a DataFrame.

cummax

cummax() -> bigframes.dataframe.DataFrame

Return cumulative maximum over a DataFrame axis.

Returns a DataFrame of the same size containing the cumulative maximum.

Returns
Type	Description
bigframes.dataframe.DataFrame	Return cumulative maximum of DataFrame.

cummin

cummin() -> bigframes.dataframe.DataFrame

Return cumulative minimum over a DataFrame axis.

Returns a DataFrame of the same size containing the cumulative minimum.

Returns
Type	Description
bigframes.dataframe.DataFrame	Return cumulative minimum of DataFrame.

cumprod

cumprod() -> bigframes.dataframe.DataFrame

Return cumulative product over a DataFrame axis.

Returns a DataFrame of the same size containing the cumulative product.

Returns
Type	Description
bigframes.dataframe.DataFrame	Return cumulative product of DataFrame.

cumsum

cumsum()

Return cumulative sum over a DataFrame axis.

Returns a DataFrame of the same size containing the cumulative sum.

Returns
Type	Description
bigframes.dataframe.DataFrame	Return cumulative sum of DataFrame.

describe

describe() -> bigframes.dataframe.DataFrame

Generate descriptive statistics.

Descriptive statistics include those that summarize the central tendency, dispersion and shape of a dataset's distribution, excluding NaN values.

Only supports numeric columns.

Note: Percentile values are approximates only.

Note: For numeric data, the result's index will include count, mean, std, min, max as well as lower, 50 and upper percentiles. By default the lower percentile is 25 and the upper percentile is 75. The 50 percentile is the same as the median.

Returns
Type	Description
bigframes.dataframe.DataFrame	Summary statistics of the Series or Dataframe provided.

div

div(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get floating division of DataFrame and other, element-wise (binary operator /).

Equivalent to dataframe / other. With reverse version, rtruediv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

divide

divide(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get floating division of DataFrame and other, element-wise (binary operator /).

Equivalent to dataframe / other. With reverse version, rtruediv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

drop

drop(
    labels: typing.Optional[typing.Any] = None,
    *,
    axis: typing.Union[int, str] = 0,
    index: typing.Optional[typing.Any] = None,
    columns: typing.Optional[
        typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]]
    ] = None,
    level: typing.Optional[typing.Union[str, int]] = None
) -> bigframes.dataframe.DataFrame

Drop specified labels from columns.

Remove columns by directly specifying column names.

Exceptions
Type	Description
KeyError	If any of the labels is not found in the selected axis.

Returns
Type	Description
bigframes.dataframe.DataFrame	DataFrame without the removed column labels.

drop_duplicates

drop_duplicates(
    subset: typing.Optional[
        typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]]
    ] = None,
    *,
    keep: str = "first"
) -> bigframes.dataframe.DataFrame

Return DataFrame with duplicate rows removed.

Considering certain columns is optional. Indexes, including time indexes are ignored.

Parameters
Name	Description
subset	column label or sequence of labels, optional Only consider certain columns for identifying duplicates, by default use all of the columns.
keep	{'first', 'last', False}, default 'first' Determines which duplicates (if any) to keep. - 'first' : Drop duplicates except for the first occurrence. - 'last' : Drop duplicates except for the last occurrence. - False : Drop all duplicates.

Returns
Type	Description
bigframes.dataframe.DataFrame	DataFrame with duplicates removed

droplevel

droplevel(level: typing.Union[str, int, typing.Sequence[typing.Union[str, int]]])

Return DataFrame with requested index / column level(s) removed.

Parameter
Name	Description
level	int, str, or list-like If a string is given, must be the name of a level If list-like, elements must be names or positional indexes of levels.

Returns
Type	Description
DataFrame	DataFrame with requested index / column level(s) removed.

dropna

dropna() -> bigframes.dataframe.DataFrame

Remove missing values.

Returns
Type	Description
bigframes.dataframe.DataFrame	DataFrame with NA entries dropped from it.

duplicated

duplicated(subset=None, keep: str = "first") -> bigframes.series.Series

Return boolean Series denoting duplicate rows.

Considering certain columns is optional.

Parameters
Name	Description
subset	column label or sequence of labels, optional Only consider certain columns for identifying duplicates, by default use all of the columns.
keep	{'first', 'last', False}, default 'first' Determines which duplicates (if any) to mark. - first : Mark duplicates as True except for the first occurrence. - last : Mark duplicates as True except for the last occurrence. - False : Mark all duplicates as True.

Returns
Type	Description
bigframes.series.Series	Boolean series for each duplicated rows.

eq

eq(other: typing.Any, axis: str | int = "columns") -> DataFrame

Get equal to of DataFrame and other, element-wise (binary operator eq).

Among flexible wrappers (eq, ne, le, lt, ge, gt) to comparison operators.

Equivalent to ==, !=, <=, <, >=, > with support to choose axis (rows or columns) and level for comparison.

Parameters
Name	Description
other	scalar, sequence, Series, or DataFrame Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'}, default 'columns' Whether to compare by the index (0 or 'index') or columns (1 or 'columns').

floordiv

floordiv(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get integer division of DataFrame and other, element-wise (binary operator //).

Equivalent to dataframe // other. With reverse version, rfloordiv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

ge

ge(other: typing.Any, axis: str | int = "columns") -> DataFrame

Get 'greater than or equal to' of DataFrame and other, element-wise (binary operator >=).

Among flexible wrappers (eq, ne, le, lt, ge, gt) to comparison operators.

Equivalent to ==, !=, <=, <, >=, > with support to choose axis (rows or columns) and level for comparison.

Note: Mismatched indices will be unioned together. NaN values in floating point columns are considered different (i.e. NaN != NaN).

Parameters
Name	Description
other	scalar, sequence, Series, or DataFrame Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'}, default 'columns' Whether to compare by the index (0 or 'index') or columns (1 or 'columns').

Returns
Type	Description
DataFrame	DataFrame of bool. The result of the comparison.

get

get(key, default=None)

Get item from object for given key (ex: DataFrame column).

Returns default value if not found.

groupby

groupby(
    by: typing.Optional[
        typing.Union[
            typing.Hashable,
            bigframes.series.Series,
            typing.Sequence[typing.Union[typing.Hashable, bigframes.series.Series]],
        ]
    ] = None,
    *,
    level: typing.Optional[
        typing.Union[str, int, typing.Sequence[typing.Union[str, int]]]
    ] = None,
    as_index: bool = True,
    dropna: bool = True
) -> bigframes.core.groupby.DataFrameGroupBy

Group DataFrame by columns.

A groupby operation involves some combination of splitting the object, applying a function, and combining the results. This can be used to group large amounts of data and compute operations on these groups.

Parameters
Name	Description
by	str, Sequence[str] A label or list of labels may be passed to group by the columns in self. Notice that a tuple is interpreted as a (single) key.
level	int, level name, or sequence of such, default None If the axis is a MultiIndex (hierarchical), group by a particular level or levels. Do not specify both by and level.
as_index	bool, default True Default True. Return object with group labels as the index. Only relevant for DataFrame input. as_index=False is effectively "SQL-style" grouped output. This argument has no effect on filtrations such as head(), tail(), nth() and in transformations.
dropna	bool, default True Default True. If True, and if group keys contain NA values, NA values together with row/column will be dropped. If False, NA values will also be treated as the key in groups.

Returns
Type	Description
bigframes.core.groupby.SeriesGroupBy	A groupby object that contains information about the groups.

gt

gt(other: typing.Any, axis: str | int = "columns") -> DataFrame

Get 'greater than' of DataFrame and other, element-wise (binary operator >).

Among flexible wrappers (eq, ne, le, lt, ge, gt) to comparison operators.

Equivalent to ==, !=, <=, <, >=, > with support to choose axis (rows or columns) and level for comparison.

Note: Mismatched indices will be unioned together. NaN values in floating point columns are considered different (i.e. NaN != NaN).

Parameters
Name	Description
other	scalar, sequence, Series, or DataFrame Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'}, default 'columns' Whether to compare by the index (0 or 'index') or columns (1 or 'columns').

Returns
Type	Description
DataFrame	DataFrame of bool: The result of the comparison.

head

head(n: int = 5) -> bigframes.dataframe.DataFrame

Return the first n rows.

This function returns the first n rows for the object based on position. It is useful for quickly testing if your object has the right type of data in it.

Not yet supported For negative values of n, this function returns all rows except the last |n| rows, equivalent to df[:n].

If n is larger than the number of rows, this function returns all rows.

Parameter
Name	Description
n	int, default 5 Default 5. Number of rows to select.

isna

isna() -> bigframes.dataframe.DataFrame

Detect missing values.

Return a boolean same-sized object indicating if the values are NA. NA values get mapped to True values. Everything else gets mapped to False values. Characters such as empty strings '' or numpy.inf are not considered NA values.

isnull

isnull() -> bigframes.dataframe.DataFrame

Detect missing values.

Return a boolean same-sized object indicating if the values are NA. NA values get mapped to True values. Everything else gets mapped to False values. Characters such as empty strings '' or numpy.inf are not considered NA values.

join

join(
    other: bigframes.dataframe.DataFrame,
    *,
    on: typing.Optional[str] = None,
    how: str = "left"
) -> bigframes.dataframe.DataFrame

Join columns of another DataFrame.

Join columns with other DataFrame on index

Parameter
Name	Description
how	{'left', 'right', 'outer', 'inner'}, default 'left'` How to handle the operation of the two objects. left: use calling frame's index (or column if on is specified) right: use other's index. outer: form union of calling frame's index (or column if on is specified) with other's index, and sort it lexicographically. inner: form intersection of calling frame's index (or column if on is specified) with other's index, preserving the order of the calling's one.

Returns
Type	Description
bigframes.dataframe.DataFrame	A dataframe containing columns from both the caller and other.

le

le(other: typing.Any, axis: str | int = "columns") -> DataFrame

Get 'less than or equal to' of dataframe and other, element-wise (binary operator <=).

Among flexible wrappers (eq, ne, le, lt, ge, gt) to comparison operators.

Equivalent to ==, !=, <=, <, >=, > with support to choose axis (rows or columns) and level for comparison.

Note: Mismatched indices will be unioned together. NaN values in floating point columns are considered different (i.e. NaN != NaN).

Parameters
Name	Description
other	scalar, sequence, Series, or DataFrame Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'}, default 'columns' Whether to compare by the index (0 or 'index') or columns (1 or 'columns').

Returns
Type	Description
DataFrame	DataFrame of bool. The result of the comparison.

lt

lt(other: typing.Any, axis: str | int = "columns") -> DataFrame

Get 'less than' of DataFrame and other, element-wise (binary operator <).

Among flexible wrappers (eq, ne, le, lt, ge, gt) to comparison operators.

Equivalent to ==, !=, <=, <, >=, > with support to choose axis (rows or columns) and level for comparison.

Note: Mismatched indices will be unioned together. NaN values in floating point columns are considered different (i.e. NaN != NaN).

Parameters
Name	Description
other	scalar, sequence, Series, or DataFrame Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'}, default 'columns' Whether to compare by the index (0 or 'index') or columns (1 or 'columns').

Returns
Type	Description
DataFrame	DataFrame of bool. The result of the comparison.

map

map(func, na_action: typing.Optional[str] = None) -> bigframes.dataframe.DataFrame

Apply a function to a Dataframe elementwise.

This method applies a function that accepts and returns a scalar to every element of a DataFrame.

Note: In pandas 2.1.0, DataFrame.applymap is deprecated and renamed to DataFrame.map.

Parameter
Name	Description
na_action	Optional[str], default None {None, 'ignore'}, default None. If ‘ignore’, propagate NaN values, without passing them to func.

Returns
Type	Description
bigframes.dataframe.DataFrame	Transformed DataFrame.

max

max(*, numeric_only: bool = False) -> bigframes.series.Series

Return the maximum of the values over the requested axis.

If you want the index of the maximum, use idxmax. This is the equivalent of the numpy.ndarray method argmax.

Parameter
Name	Description
numeric_only	bool. default False Default False. Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series after the maximum of values.

mean

mean(*, numeric_only: bool = False) -> bigframes.series.Series

Return the mean of the values over the requested axis.

Parameter
Name	Description
numeric_only	bool. default False Default False. Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with the mean of values.

median

median(
    *, numeric_only: bool = False, exact: bool = False
) -> bigframes.series.Series

Return the median of the values over the requested axis.

Parameters
Name	Description
numeric_only	bool. default False Default False. Include only float, int, boolean columns.
exact	bool. default False Default False. Get the exact median instead of an approximate one. Note: exact=True not yet supported.

Returns
Type	Description
bigframes.series.Series	Series with the median of values.

merge

merge(
    right: bigframes.dataframe.DataFrame,
    how: typing.Literal["inner", "left", "outer", "right"] = "inner",
    on: typing.Optional[str] = None,
    *,
    left_on: typing.Optional[str] = None,
    right_on: typing.Optional[str] = None,
    sort: bool = False,
    suffixes: tuple[str, str] = ("_x", "_y")
) -> bigframes.dataframe.DataFrame

Merge DataFrame objects with a database-style join.

The join is done on columns or indexes. If joining columns on columns, the DataFrame indexes will be ignored. Otherwise if joining indexes on indexes or indexes on a column or columns, the index will be passed on. When performing a cross merge, no column specifications to merge on are allowed.

Warning: If both key columns contain rows where the key is a null value, those rows will be matched against each other. This is different from usual SQL join behaviour and can lead to unexpected results.

Returns
Type	Description
bigframes.dataframe.DataFrame	A DataFrame of the two merged objects.

min

min(*, numeric_only: bool = False) -> bigframes.series.Series

Return the minimum of the values over the requested axis.

If you want the index of the minimum, use idxmin. This is the equivalent of the numpy.ndarray method argmin.

Parameter
Name	Description
numeric_only	bool, default False Default False. Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with the minimum of the values.

mod

mod(other: int | bigframes.series.Series, axis: str | int = "columns") -> DataFrame

Get modulo of DataFrame and other, element-wise (binary operator %).

Equivalent to dataframe % other. With reverse version, rmod.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameter
Name	Description
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

mul

mul(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get multiplication of DataFrame and other, element-wise (binary operator *).

Equivalent to dataframe * other. With reverse version, rmul.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

multiply

multiply(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get multiplication of DataFrame and other, element-wise (binary operator *).

Equivalent to dataframe * other. With reverse version, rmul.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

ne

ne(other: typing.Any, axis: str | int = "columns") -> DataFrame

Get not equal to of DataFrame and other, element-wise (binary operator ne).

Among flexible wrappers (eq, ne, le, lt, ge, gt) to comparison operators.

Equivalent to ==, !=, <=, <, >=, > with support to choose axis (rows or columns) and level for comparison.

Parameters
Name	Description
other	scalar, sequence, Series, or DataFrame Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'}, default 'columns' Whether to compare by the index (0 or 'index') or columns (1 or 'columns').

Returns
Type	Description
DataFrame	Result of the comparison.

notna

notna() -> bigframes.dataframe.DataFrame

Detect existing (non-missing) values.

Return a boolean same-sized object indicating if the values are not NA. Non-missing values get mapped to True. Characters such as empty strings '' or numpy.inf are not considered NA values. NA values get mapped to False values.

Returns
Type	Description
NDFrame	Mask of bool values for each element that indicates whether an element is not an NA value.

notnull

notnull() -> bigframes.dataframe.DataFrame

Detect existing (non-missing) values.

Return a boolean same-sized object indicating if the values are not NA. Non-missing values get mapped to True. Characters such as empty strings '' or numpy.inf are not considered NA values. NA values get mapped to False values.

Returns
Type	Description
NDFrame	Mask of bool values for each element that indicates whether an element is not an NA value.

nunique

nunique() -> bigframes.series.Series

Count number of distinct elements in specified axis.

Returns
Type	Description
bigframes.series.Series	Series with number of distinct elements.

pivot

pivot(
    *,
    columns: typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]],
    index: typing.Optional[
        typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]]
    ] = None,
    values: typing.Optional[
        typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]]
    ] = None
) -> bigframes.dataframe.DataFrame

Return reshaped DataFrame organized by given index / column values.

Reshape data (produce a "pivot" table) based on column values. Uses unique values from specified index / columns to form axes of the resulting DataFrame. This function does not support data aggregation, multiple values will result in a MultiIndex in the columns.

Note: BigQuery supports up to 10000 columns. Pivot operations on columns with too many unique values will fail if they would exceed this limit.

Note: The validity of the pivot operation is not checked. If columns and index do not together uniquely identify input rows, the output will be silently non-deterministic.

Parameters
Name	Description
columns	str or object or a list of str Column to use to make new frame's columns.
index	str or object or a list of str, optional Column to use to make new frame's index. If not given, uses existing index.
values	str, object or a list of the previous, optional Column(s) to use for populating new frame's values. If not specified, all remaining columns will be used and the result will have hierarchically indexed columns.

prod

prod(*, numeric_only: bool = False) -> bigframes.series.Series

Return the product of the values over the requested axis.

Parameter
Name	Description
numeric_only	bool. default False Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with the product of the values.

product

product(*, numeric_only: bool = False) -> bigframes.series.Series

Return the product of the values over the requested axis.

Parameter
Name	Description
numeric_only	bool. default False Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with the product of the values.

radd

radd(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get addition of DataFrame and other, element-wise (binary operator +).

Equivalent to dataframe + other. With reverse version, radd.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

rank

rank(
    axis=0,
    method: str = "average",
    numeric_only=False,
    na_option: str = "keep",
    ascending=True,
) -> bigframes.dataframe.DataFrame

Compute numerical data ranks (1 through n) along axis.

By default, equal values are assigned a rank that is the average of the ranks of those values.

Parameters
Name	Description
method	{'average', 'min', 'max', 'first', 'dense'}, default 'average' How to rank the group of records that have the same value (i.e. ties): average: average rank of the group, min: lowest rank in the group max: highest rank in the group, first: ranks assigned in order they appear in the array, dense`: like 'min', but rank always increases by 1 between groups.
numeric_only	bool, default False For DataFrame objects, rank only numeric columns if set to True.
na_option	{'keep', 'top', 'bottom'}, default 'keep' How to rank NaN values: keep: assign NaN rank to NaN values, , top: assign lowest rank to NaN values, bottom: assign highest rank to NaN values.
ascending	bool, default True Whether or not the elements should be ranked in ascending order.

Returns
Type	Description
same type as caller	Return a Series or DataFrame with data ranks as values.

rdiv

rdiv(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get floating division of DataFrame and other, element-wise (binary operator /).

Equivalent to other / dataframe. With reverse version, truediv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

rename

rename(
    *, columns: typing.Mapping[typing.Hashable, typing.Hashable]
) -> bigframes.dataframe.DataFrame

Rename columns.

Dict values must be unique (1-to-1). Labels not contained in a dict will be left as-is. Extra labels listed don't throw an error.

Parameter
Name	Description
columns	Mapping Dict-like from old column labels to new column labels.

Exceptions
Type	Description
KeyError	If any of the labels is not found.

Returns
Type	Description
bigframes.dataframe.DataFrame	DataFrame with the renamed axis labels.

rename_axis

rename_axis(
    mapper: typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]], **kwargs
) -> bigframes.dataframe.DataFrame

Set the name of the axis for the index.

Note: Currently only accepts a single string parameter (the new name of the index).

Returns
Type	Description
bigframes.dataframe.DataFrame	DataFrame with the new index name

reorder_levels

reorder_levels(
    order: typing.Union[str, int, typing.Sequence[typing.Union[str, int]]]
)

Rearrange index levels using input order. May not drop or duplicate levels.

Parameter
Name	Description
order	list of int or list of str List representing new level order. Reference level by number (position) or by key (label).

Returns
Type	Description
DataFrame	DataFrame of rearranged index.

reset_index

reset_index(*, drop: bool = False) -> bigframes.dataframe.DataFrame

Reset the index.

Reset the index of the DataFrame, and use the default one instead.

Parameter
Name	Description
drop	bool, default False Do not try to insert index into dataframe columns. This resets the index to the default integer index.

Returns
Type	Description
bigframes.dataframe.DataFrame	DataFrame with the new index.

rfloordiv

rfloordiv(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get integer division of DataFrame and other, element-wise (binary operator //).

Equivalent to other // dataframe. With reverse version, rfloordiv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

rmod

rmod(
    other: int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get modulo of DataFrame and other, element-wise (binary operator %).

Equivalent to other % dataframe. With reverse version, mod.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

rmul

rmul(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get multiplication of DataFrame and other, element-wise (binary operator *).

Equivalent to dataframe * other. With reverse version, rmul.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

rsub

rsub(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get subtraction of DataFrame and other, element-wise (binary operator -).

Equivalent to other - dataframe. With reverse version, sub.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

rtruediv

rtruediv(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get floating division of DataFrame and other, element-wise (binary operator /).

Equivalent to other / dataframe. With reverse version, truediv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

sample

sample(
    n: typing.Optional[int] = None,
    frac: typing.Optional[float] = None,
    *,
    random_state: typing.Optional[int] = None
) -> bigframes.dataframe.DataFrame

Return a random sample of items from an axis of object.

You can use random_state for reproducibility.

Parameters
Name	Description
n	Optional[int], default None Number of items from axis to return. Cannot be used with frac. Default = 1 if frac = None.
frac	Optional[float], default None Fraction of axis items to return. Cannot be used with n.
random_state	Optional[int], default None Seed for random number generator.

set_index

set_index(
    keys: typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]],
    append: bool = False,
    drop: bool = True,
) -> bigframes.dataframe.DataFrame

Set the DataFrame index using existing columns.

Set the DataFrame index (row labels) using one existing column. The index can replace the existing index.

Returns
Type	Description
DataFrame	Changed row labels.

shift

shift(periods: int = 1) -> bigframes.dataframe.DataFrame

Shift index by desired number of periods.

Shifts the index without realigning the data.

Returns
Type	Description
NDFrame	Copy of input object, shifted.

sort_index

sort_index(
    ascending: bool = True, na_position: typing.Literal["first", "last"] = "last"
) -> bigframes.dataframe.DataFrame

Sort object by labels (along an axis).

sort_values

sort_values(
    by: str | typing.Sequence[str],
    *,
    ascending: bool | typing.Sequence[bool] = True,
    kind: str = "quicksort",
    na_position: typing.Literal["first", "last"] = "last"
) -> DataFrame

Sort by the values along row axis.

Parameters
Name	Description
by	str or Sequence[str] Name or list of names to sort by.
ascending	bool or Sequence[bool], default True Sort ascending vs. descending. Specify list for multiple sort orders. If this is a list of bools, must match the length of the by.
kind	str, default quicksort Choice of sorting algorithm. Accepts 'quicksort’, ‘mergesort’, ‘heapsort’, ‘stable’. Ignored except when determining whether to sort stably. 'mergesort' or 'stable' will result in stable reorder.
na_position	{'first', 'last'}, default last {'first', 'last'}, default 'last' Puts NaNs at the beginning if first; last puts NaNs at the end.

std

std(*, numeric_only: bool = False) -> bigframes.series.Series

Return sample standard deviation over requested axis.

Normalized by N-1 by default.

Parameter
Name	Description
numeric_only	bool. default False Default False. Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with sample standard deviation.

sub

sub(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get subtraction of DataFrame and other, element-wise (binary operator -).

Equivalent to dataframe - other. With reverse version, rsub.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

subtract

subtract(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get subtraction of DataFrame and other, element-wise (binary operator -).

Equivalent to dataframe - other. With reverse version, rsub.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

sum

sum(*, numeric_only: bool = False) -> bigframes.series.Series

Return the sum of the values over the requested axis.

This is equivalent to the method numpy.sum.

Parameter
Name	Description
numeric_only	bool. default False Default False. Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with the sum of values.

tail

tail(n: int = 5) -> bigframes.dataframe.DataFrame

Return the last n rows.

This function returns last n rows from the object based on position. It is useful for quickly verifying data, for example, after sorting or appending rows.

For negative values of n, this function returns all rows except the first |n| rows, equivalent to df[|n|:].

If n is larger than the number of rows, this function returns all rows.

Parameter
Name	Description
n	int, default 5 Number of rows to select.

to_csv

to_csv(
    path_or_buf: str, sep=",", *, header: bool = True, index: bool = True
) -> None

Write object to a comma-separated values (csv) file on Cloud Storage.

Parameters
Name	Description
path_or_buf	str A destination URI of Cloud Storage files(s) to store the extracted dataframe in format of gs://<bucket_name>/<object_name_or_glob>. If the data size is more than 1GB, you must use a wildcard to export the data into multiple files and the size of the files varies. None, file-like objects or local file paths not yet supported.
index	bool, default True If True, write row names (index).

Returns
Type	Description
None	String output not yet supported.

to_gbq

to_gbq(
    destination_table: str,
    *,
    if_exists: typing.Optional[typing.Literal["fail", "replace", "append"]] = "fail",
    index: bool = True,
    ordering_id: typing.Optional[str] = None
) -> None

Write a DataFrame to a BigQuery table.

Parameters
Name	Description
destination_table	str Name of table to be written, in the form dataset.tablename or project.dataset.tablename.
if_exists	str, default 'fail' Behavior when the destination table exists. Value can be one of: 'fail' If table exists raise pandas_gbq.gbq.TableCreationError. 'replace' If table exists, drop it, recreate it, and insert data. 'append' If table exists, insert data. Create if does not exist.
index	bool. default True whether write row names (index) or not.
ordering_id	Optional[str], default None If set, write the ordering of the DataFrame as a column in the result table with this name.

to_json

to_json(
    path_or_buf: str,
    orient: typing.Literal[
        "split", "records", "index", "columns", "values", "table"
    ] = "columns",
    *,
    lines: bool = False,
    index: bool = True
) -> None

Convert the object to a JSON string, written to Cloud Storage.

Note NaN's and None will be converted to null and datetime objects will be converted to UNIX timestamps.

Note: Only orient='records' and lines=True is supported so far.

Parameters
Name	Description
path_or_buf	str A destination URI of Cloud Storage files(s) to store the extracted dataframe in format of gs://<bucket_name>/<object_name_or_glob>. Must contain a wildcard * character. If the data size is more than 1GB, you must use a wildcard to export the data into multiple files and the size of the files varies. None, file-like objects or local file paths not yet supported.
orient	{split, records, index, columns, values, table}, default 'columns Indication of expected JSON string format. * Series: - default is 'index' - allowed values are: {{'split', 'records', 'index', 'table'}}. * DataFrame: - default is 'columns' - allowed values are: {{'split', 'records', 'index', 'columns', 'values', 'table'}}. * The format of the JSON string: - 'split' : dict like {{'index' -> [index], 'columns' -> [columns], 'data' -> [values]}} - 'records' : list like [{{column -> value}}, ... , {{column -> value}}] - 'index' : dict like {{index -> {{column -> value}}}} - 'columns' : dict like {{column -> {{index -> value}}}} - 'values' : just the values array - 'table' : dict like {{'schema': {{schema}}, 'data': {{data}}}} Describing the data, where data component is like orient='records'.
index	bool, default True If True, write row names (index).
lines	bool, default False If 'orient' is 'records' write out line-delimited json format. Will throw ValueError if incorrect 'orient' since others are not list-like.

Returns
Type	Description
None	String output not yet supported.

to_numpy

to_numpy(dtype=None, copy=False, na_value=None, **kwargs) -> numpy.ndarray

Convert the DataFrame to a NumPy array.

Parameters
Name	Description
dtype	None The dtype to pass to numpy.asarray().
copy	bool, default None Whether to ensure that the returned value is not a view on another array.
na_value	Any, default None The value to use for missing values. The default value depends on dtype and the dtypes of the DataFrame columns.

Returns
Type	Description
numpy.ndarray	The converted NumPy array.

to_pandas

to_pandas(
    max_download_size: typing.Optional[int] = None,
    sampling_method: typing.Optional[str] = None,
    random_state: typing.Optional[int] = None,
) -> pandas.core.frame.DataFrame

Write DataFrame to pandas DataFrame.

Parameters
Name	Description
max_download_size	int, default None Download size threshold in MB. If max_download_size is exceeded when downloading data (e.g., to_pandas()), the data will be downsampled if bigframes.options.sampling.enable_downsampling is True, otherwise, an error will be raised. If set to a value other than None, this will supersede the global config.
sampling_method	str, default None Downsampling algorithms to be chosen from, the choices are: "head": This algorithm returns a portion of the data from the beginning. It is fast and requires minimal computations to perform the downsampling; "uniform": This algorithm returns uniform random samples of the data. If set to a value other than None, this will supersede the global config.
random_state	int, default None The seed for the uniform downsampling algorithm. If provided, the uniform method may take longer to execute and require more computation. If set to a value other than None, this will supersede the global config.

Returns
Type	Description
pandas.DataFrame	A pandas DataFrame with all rows and columns of this DataFrame if the data_sampling_threshold_mb is not exceeded; otherwise, a pandas DataFrame with downsampled rows and all columns of this DataFrame.

to_parquet

to_parquet(path: str, *, index: bool = True) -> None

Write a DataFrame to the binary Parquet format.

This function writes the dataframe as a parquet file <https://parquet.apache.org/>_ to Cloud Storage.

Parameters
Name	Description
path	str Destination URI(s) of Cloud Storage files(s) to store the extracted dataframe in format of gs://<bucket_name>/<object_name_or_glob>. If the data size is more than 1GB, you must use a wildcard to export the data into multiple files and the size of the files varies.
index	bool, default True If True, include the dataframe's index(es) in the file output. If False, they will not be written to the file.

truediv

truediv(
    other: float | int | bigframes.series.Series, axis: str | int = "columns"
) -> DataFrame

Get floating division of DataFrame and other, element-wise (binary operator /).

Equivalent to dataframe / other. With reverse version, rtruediv.

Among flexible wrappers (add, sub, mul, div, mod, pow) to arithmetic operators: +, -, *, /, //, %, **.

Note: Mismatched indices will be unioned together.

Parameters
Name	Description
other	float, int, or Series Any single or multiple element data structure, or list-like object.
axis	{0 or 'index', 1 or 'columns'} Whether to compare by the index (0 or 'index') or columns. (1 or 'columns'). For Series input, axis to match Series index on.

Returns
Type	Description
DataFrame	DataFrame result of the arithmetic operation.

value_counts

value_counts(
    subset: typing.Optional[
        typing.Union[typing.Hashable, typing.Sequence[typing.Hashable]]
    ] = None,
    normalize: bool = False,
    sort: bool = True,
    ascending: bool = False,
    dropna: bool = True,
)

Return a Series containing counts of unique rows in the DataFrame.

Parameters
Name	Description
subset	label or list of labels, optional Columns to use when counting unique combinations.
normalize	bool, default False Return proportions rather than frequencies.
sort	bool, default True Sort by frequencies.
ascending	bool, default False Sort in ascending order.
dropna	bool, default True Don’t include counts of rows that contain NA values.

Returns
Type	Description
Series	Series containing counts of unique rows in the DataFrame

var

var(*, numeric_only: bool = False) -> bigframes.series.Series

Return unbiased variance over requested axis.

Normalized by N-1 by default.

Parameter
Name	Description
numeric_only	bool. default False Default False. Include only float, int, boolean columns.

Returns
Type	Description
bigframes.series.Series	Series with unbiased variance over requested axis.