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StringMethods(
data=None,
index: vendored_pandas_typing.Axes | None = None,
dtype: typing.Optional[
bigframes.dtypes.DtypeString | bigframes.dtypes.Dtype
] = None,
name: str | None = None,
copy: typing.Optional[bool] = None,
*,
session: typing.Optional[bigframes.session.Session] = None
)
Vectorized string functions for Series and Index.
NAs stay NA unless handled otherwise by a particular method. Patterned after Python's string methods, with some inspiration from R's stringr package.
Methods
capitalize
capitalize() -> bigframes.series.Series
Convert strings in the Series/Index to be capitalized.
Equivalent to str.capitalize
.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with captitalized strings. |
cat
cat(
others: typing.Union[str, bigframes.series.Series],
*,
join: typing.Literal["outer", "left"] = "left"
) -> bigframes.series.Series
Concatenate strings in the Series/Index with given separator.
If others
is specified, this function concatenates the Series/Index
and elements of others
element-wise.
Parameter | |
---|---|
Name | Description |
join |
{'left', 'outer'}, default 'left'
Determines the join-style between the calling Series and any Series in |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with concatenated strings. |
center
center(width: int, fillchar: str = " ") -> bigframes.series.Series
Pad left and right side of strings in the Series/Index.
Equivalent to str.center
.
Parameters | |
---|---|
Name | Description |
width |
int
Minimum width of resulting string; additional characters will be filled with character defined in |
fillchar |
str, default ' '
Additional character for filling, default is whitespace. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Returns Series or Index with minimum number of char in object. |
contains
contains(
pat, case: bool = True, flags: int = 0, *, regex: bool = True
) -> bigframes.series.Series
Test if pattern or regex is contained within a string of a Series or Index.
Return boolean Series or Index based on whether a given pattern or regex is contained within a string of a Series or Index.
Parameters | |
---|---|
Name | Description |
pat |
str, re.Pattern
Character sequence or regular expression. |
case |
bool, default True
If True, case sensitive. |
flags |
int, default 0
Flags to pass through to the re module, e.g. re.IGNORECASE. |
regex |
bool, default True
If True, assumes the pat is a regular expression. If False, treats the pat as a literal string. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | A Series or Index of boolean values indicating whether the given pattern is contained within the string of each element of the Series or Index. |
endswith
endswith(pat: typing.Union[str, tuple[str, ...]]) -> bigframes.series.Series
Test if the end of each string element matches a pattern.
Parameter | |
---|---|
Name | Description |
pat |
str, tuple[str, ...]
Character sequence or tuple of strings. Regular expressions are not accepted. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | A Series of booleans indicating whether the given pattern matches the end of each string element. |
extract
extract(pat: str, flags: int = 0) -> bigframes.dataframe.DataFrame
Extract capture groups in the regex pat
as columns in a DataFrame.
For each subject string in the Series, extract groups from the
first match of regular expression pat
.
find
find(
sub: str, start: typing.Optional[int] = None, end: typing.Optional[int] = None
) -> bigframes.series.Series
Return lowest indexes in each strings in the Series/Index.
Each of returned indexes corresponds to the position where the
substring is fully contained between [start:end]. Return -1 on
failure. Equivalent to standard str.find
.
Parameters | |
---|---|
Name | Description |
start |
int, default 0
Left edge index. |
end |
None
Right edge index. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with lowest indexes in each strings. |
fullmatch
fullmatch(pat, case=True, flags=0) -> bigframes.series.Series
Determine if each string entirely matches a regular expression.
Parameters | |
---|---|
Name | Description |
pat |
str
Character sequence or regular expression. |
case |
bool
If True, case sensitive. |
flags |
int, default 0
Regex module flags, e.g. re.IGNORECASE. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series of boolean values |
get
get(i: int) -> bigframes.series.Series
Extract element from each component at specified position or with specified key.
Extract element from lists, tuples, dict, or strings in each element in the Series/Index.
Parameter | |
---|---|
Name | Description |
i |
int
Position or key of element to extract. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series |
isalnum
isalnum() -> bigframes.series.Series
Check whether all characters in each string are alphanumeric.
This is equivalent to running the Python string method
str.isalnum
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of boolean values with the same length as the original Series/Index. |
isalpha
isalpha() -> bigframes.series.Series
Check whether all characters in each string are alphabetic.
This is equivalent to running the Python string method
str.isalpha
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with the same length as the originalSeries/Index. |
isdecimal
isdecimal() -> bigframes.series.Series
Check whether all characters in each string are decimal.
This is equivalent to running the Python string method
str.isdecimal
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of boolean values with the same length as the original Series/Index. |
isdigit
isdigit() -> bigframes.series.Series
Check whether all characters in each string are digits.
This is equivalent to running the Python string method
str.isdigit
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with the same length as the originalSeries/Index. |
islower
islower() -> bigframes.series.Series
Check whether all characters in each string are lowercase.
This is equivalent to running the Python string method
str.islower
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of boolean values with the same length as the original Series/Index. |
isnumeric
isnumeric() -> bigframes.series.Series
Check whether all characters in each string are numeric.
This is equivalent to running the Python string method
str.isnumeric
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of boolean values with the same length as the original Series/Index. |
isspace
isspace() -> bigframes.series.Series
Check whether all characters in each string are whitespace.
This is equivalent to running the Python string method
str.isspace
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of boolean values with the same length as the original Series/Index. |
isupper
isupper() -> bigframes.series.Series
Check whether all characters in each string are uppercase.
This is equivalent to running the Python string method
str.isupper
for each element of the Series/Index. If a string
has zero characters, False
is returned for that check.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of boolean values with the same length as the original Series/Index. |
len
len() -> bigframes.series.Series
Compute the length of each element in the Series/Index.
The element may be a sequence (such as a string, tuple or list) or a collection (such as a dictionary).
Returns | |
---|---|
Type | Description |
bigframes.series.Series | A Series or Index of integer values indicating the length of each element in the Series or Index. |
ljust
ljust(width, fillchar=" ") -> bigframes.series.Series
Pad right side of strings in the Series/Index up to width.
Parameters | |
---|---|
Name | Description |
width |
int
Minimum width of resulting string; additional characters will be filled with character defined in |
fillchar |
str, default ' '
Additional character for filling, default is whitespace. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Returns Series or Index with minimum number of char in object. |
lower
lower() -> bigframes.series.Series
Convert strings in the Series/Index to lowercase.
Equivalent to str.lower
.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with lowercase. |
lstrip
lstrip() -> bigframes.series.Series
Remove leading characters.
Strip whitespaces (including newlines) or a set of specified characters
from each string in the Series/Index from left side.
Replaces any non-strings in Series with NaNs.
Equivalent to str.lstrip
.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series without leading characters. |
match
match(pat, case=True, flags=0) -> bigframes.series.Series
Determine if each string starts with a match of a regular expression.
Parameters | |
---|---|
Name | Description |
pat |
str
Character sequence or regular expression. |
case |
bool
If True, case sensitive. |
flags |
int, default 0
Regex module flags, e.g. re.IGNORECASE. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series of boolean values |
pad
pad(width, side="left", fillchar=" ") -> bigframes.series.Series
Pad strings in the Series/Index up to width.
Parameters | |
---|---|
Name | Description |
width |
int
Minimum width of resulting string; additional characters will be filled with character defined in |
side |
{'left', 'right', 'both'}, default 'left'
Side from which to fill resulting string. |
fillchar |
str, default ' '
Additional character for filling, default is whitespace. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Returns Series or Index with minimum number of char in object. |
repeat
repeat(repeats: int) -> bigframes.series.Series
Duplicate each string in the Series or Index.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index of repeated string objects specified by input parameter repeats. |
replace
replace(
pat: typing.Union[str, re.Pattern],
repl: str,
*,
case: typing.Optional[bool] = None,
flags: int = 0,
regex: bool = False
) -> bigframes.series.Series
Replace each occurrence of pattern/regex in the Series/Index.
Equivalent to str.replace
or re.sub
, depending on
the regex value.
Parameters | |
---|---|
Name | Description |
pat |
str, re.Pattern
String can be a character sequence or regular expression. |
repl |
str
Replacement string. |
case |
default None
Determines if replace is case sensitive: - If True, case sensitive (the default if |
flags |
int, default 0
Regex module flags, e.g. re.IGNORECASE. Cannot be set if |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | A copy of the object with all matching occurrences of pat replaced by repl . |
reverse
reverse() -> bigframes.series.Series
Reverse strings in the Series.
rjust
rjust(width, fillchar=" ") -> bigframes.series.Series
Pad left side of strings in the Series/Index up to width.
Parameters | |
---|---|
Name | Description |
width |
int
Minimum width of resulting string; additional characters will be filled with character defined in |
fillchar |
str, default ' '
Additional character for filling, default is whitespace. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Returns Series or Index with minimum number of char in object. |
rstrip
rstrip() -> bigframes.series.Series
Remove trailing characters.
Strip whitespaces (including newlines) or a set of specified characters
from each string in the Series/Index from right side.
Replaces any non-strings in Series with NaNs.
Equivalent to str.rstrip
.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series without trailing characters. |
slice
slice(
start: typing.Optional[int] = None, stop: typing.Optional[int] = None
) -> bigframes.series.Series
Slice substrings from each element in the Series or Index.
Parameters | |
---|---|
Name | Description |
start |
int, optional
Start position for slice operation. |
stop |
int, optional
Stop position for slice operation. |
step |
int, optional
Step size for slice operation. |
startswith
startswith(pat: typing.Union[str, tuple[str, ...]]) -> bigframes.series.Series
Test if the start of each string element matches a pattern.
Parameter | |
---|---|
Name | Description |
pat |
str, tuple[str, ...]
Character sequence or tuple of strings. Regular expressions are not accepted. |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | A Series of booleans indicating whether the given pattern matches the start of each string element. |
strip
strip() -> bigframes.series.Series
Remove leading and trailing characters.
Strip whitespaces (including newlines) or a set of specified characters
from each string in the Series/Index from left and right sides.
Replaces any non-strings in Series with NaNs.
Equivalent to str.strip
.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series or Index without leading and trailing characters. |
upper
upper() -> bigframes.series.Series
Convert strings in the Series/Index to uppercase.
Equivalent to str.upper
.
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series with uppercase strings. |
zfill
zfill(width: int) -> bigframes.series.Series
Pad strings in the Series/Index by prepending '0' characters.
Strings in the Series/Index are padded with '0' characters on the
left of the string to reach a total string length width
. Strings
in the Series/Index with length greater or equal to width
are
unchanged.
Parameter | |
---|---|
Name | Description |
width |
int
Minimum length of resulting string; strings with length less than |
Returns | |
---|---|
Type | Description |
bigframes.series.Series | Series of objects. |