Class DataFrameGroupBy (1.5.0)

Version 1.5.0

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DataFrameGroupBy(
    block: bigframes.core.blocks.Block,
    by_col_ids: typing.Sequence[str],
    *,
    selected_cols: typing.Optional[typing.Sequence[str]] = None,
    dropna: bool = True,
    as_index: bool = True
)

Class for grouping and aggregating relational data.

Methods

agg

agg(func=None, **kwargs) -> bigframes.dataframe.DataFrame

Aggregate using one or more operations.

Parameter
Name	Description
func	function, str, list, dict or None Function to use for aggregating the data. Accepted combinations are: - string function name - list of function names, e.g. ['sum', 'mean'] - dict of axis labels -> function names or list of such. - None, in which case kwargs are used with Named Aggregation. Here the output has one column for each element in kwargs. The name of the column is keyword, whereas the value determines the aggregation used to compute the values in the column.

aggregate

aggregate(func=None, **kwargs) -> bigframes.dataframe.DataFrame

API documentation for aggregate method.

all

all() -> bigframes.dataframe.DataFrame

Return True if all values in the group are true, else False.

Returns
Type	Description
Series or DataFrame	DataFrame or Series of boolean values, where a value is True if all elements are True within its respective group; otherwise False.

any

any() -> bigframes.dataframe.DataFrame

Return True if any value in the group is true, else False.

Returns
Type	Description
Series or DataFrame	DataFrame or Series of boolean values, where a value is True if any element is True within its respective group; otherwise False.

count

count() -> bigframes.dataframe.DataFrame

Compute count of group, excluding missing values.

Returns
Type	Description
Series or DataFrame	Count of values within each group.

cumcount

cumcount(ascending: bool = True)

Number each item in each group from 0 to the length of that group - 1.

Parameter
Name	Description
ascending	bool, default True If False, number in reverse, from length of group - 1 to 0.

Returns
Type	Description
Series	Sequence number of each element within each group.

cummax

cummax(
    *args, numeric_only: bool = False, **kwargs
) -> bigframes.dataframe.DataFrame

Cumulative max for each group.

Returns
Type	Description
Series or DataFrame	Cumulative max for each group.

cummin

cummin(
    *args, numeric_only: bool = False, **kwargs
) -> bigframes.dataframe.DataFrame

Cumulative min for each group.

Returns
Type	Description
Series or DataFrame	Cumulative min for each group.

cumprod

cumprod(*args, **kwargs) -> bigframes.dataframe.DataFrame

Cumulative product for each group.

Returns
Type	Description
Series or DataFrame	Cumulative product for each group.

cumsum

cumsum(
    *args, numeric_only: bool = False, **kwargs
) -> bigframes.dataframe.DataFrame

Cumulative sum for each group.

Returns
Type	Description
Series or DataFrame	Cumulative sum for each group.

diff

diff(periods=1) -> bigframes.series.Series

First discrete difference of element. Calculates the difference of each element compared with another element in the group (default is element in previous row).

Returns
Type	Description
Series or DataFrame	First differences.

expanding

expanding(min_periods: int = 1) -> bigframes.core.window.Window

Provides expanding functionality.

Returns
Type	Description
Series or DataFrame	An expanding grouper, providing expanding functionality per group.

kurt

kurt(*, numeric_only: bool = False) -> bigframes.dataframe.DataFrame

Return unbiased kurtosis over requested axis.

Kurtosis obtained using Fisher's definition of kurtosis (kurtosis of normal == 0.0). Normalized by N-1.

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

kurtosis

kurtosis(*, numeric_only: bool = False) -> bigframes.dataframe.DataFrame

API documentation for kurtosis method.

max

max(numeric_only: bool = False, *args) -> bigframes.dataframe.DataFrame

Compute max of group values.

Parameters
Name	Description
numeric_only	bool, default False Include only float, int, boolean columns.
min_count	int, default 0 The required number of valid values to perform the operation. If fewer than min_count and non-NA values are present, the result will be NA.

Returns
Type	Description
Series or DataFrame	Computed max of values within each group.

mean

mean(numeric_only: bool = False, *args) -> bigframes.dataframe.DataFrame

Compute mean of groups, excluding missing values.

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

Returns
Type	Description
pandas.Series or pandas.DataFrame	Mean of groups.

median

median(
    numeric_only: bool = False, *, exact: bool = True
) -> bigframes.dataframe.DataFrame

Compute median of groups, excluding missing values.

Parameters
Name	Description
numeric_only	bool, default False Include only float, int, boolean columns.
exact	bool, default True Calculate the exact median instead of an approximation.

Returns
Type	Description
pandas.Series or pandas.DataFrame	Median of groups.

min

min(numeric_only: bool = False, *args) -> bigframes.dataframe.DataFrame

Compute min of group values.

Parameters
Name	Description
numeric_only	bool, default False Include only float, int, boolean columns.
min_count	int, default 0 The required number of valid values to perform the operation. If fewer than min_count and non-NA values are present, the result will be NA.

Returns
Type	Description
Series or DataFrame	Computed min of values within each group.

nunique

nunique() -> bigframes.dataframe.DataFrame

Return DataFrame with counts of unique elements in each position.

prod

prod(numeric_only: bool = False, min_count: int = 0)

Compute prod of group values.

Parameters
Name	Description
numeric_only	bool, default False Include only float, int, boolean columns.
min_count	int, default 0 The required number of valid values to perform the operation. If fewer than min_count and non-NA values are present, the result will be NA.

Returns
Type	Description
Series or DataFrame	Computed prod of values within each group.

quantile

quantile(
    q: typing.Union[float, typing.Sequence[float]] = 0.5, *, numeric_only: bool = False
) -> bigframes.dataframe.DataFrame

Return group values at the given quantile, a la numpy.percentile.

Examples:

>>> import bigframes.pandas as bpd
>>> bpd.options.display.progress_bar = None
>>> df = bpd.DataFrame([
...     ['a', 1], ['a', 2], ['a', 3],
...     ['b', 1], ['b', 3], ['b', 5]
... ], columns=['key', 'val'])
>>> df.groupby('key').quantile()
     val
key
a    2.0
b    3.0
<BLANKLINE>
[2 rows x 1 columns]

Parameters
Name	Description
q	float or array-like, default 0.5 (50% quantile) Value(s) between 0 and 1 providing the quantile(s) to compute.
numeric_only	bool, default False Include only float, int or boolean data.

Returns
Type	Description
Series or DataFrame	Return type determined by caller of GroupBy object.

rolling

rolling(window: int, min_periods=None) -> bigframes.core.window.Window

Returns a rolling grouper, providing rolling functionality per group.

Parameter
Name	Description
min_periods	int, default None Minimum number of observations in window required to have a value; otherwise, result is np.nan. For a window that is specified by an offset, min_periods will default to 1. For a window that is specified by an integer, min_periods will default to the size of the window.

Returns
Type	Description
Series or DataFrame	Return a new grouper with our rolling appended.

shift

shift(periods=1) -> bigframes.series.Series

Shift each group by periods observations.

Parameter
Name	Description
periods	int, default 1 Number of periods to shift.

Returns
Type	Description
Series or DataFrame	Object shifted within each group.

skew

skew(*, numeric_only: bool = False) -> bigframes.dataframe.DataFrame

Return unbiased skew within groups.

Normalized by N-1.

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

std

std(*, numeric_only: bool = False) -> bigframes.dataframe.DataFrame

Compute standard deviation of groups, excluding missing values.

For multiple groupings, the result index will be a MultiIndex.

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

Returns
Type	Description
Series or DataFrame	Standard deviation of values within each group.

sum

sum(numeric_only: bool = False, *args) -> bigframes.dataframe.DataFrame

Compute sum of group values.

Parameters
Name	Description
numeric_only	bool, default False Include only float, int, boolean columns.
min_count	int, default 0 The required number of valid values to perform the operation. If fewer than min_count and non-NA values are present, the result will be NA.

Returns
Type	Description
Series or DataFrame	Computed sum of values within each group.

var

var(*, numeric_only: bool = False) -> bigframes.dataframe.DataFrame

Compute variance of groups, excluding missing values.

For multiple groupings, the result index will be a MultiIndex.

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