Class StringMethods (0.16.0)

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 `others` (objects without an index need to match the length of the calling Series). To disable alignment, use `.values` on any Series/Index/DataFrame in `others`.

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`.
`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`.
`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 `fillchar`.
`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 `pat` is a string) - Set to False for case insensitive - Cannot be set if `pat` is a compiled regex.
`flags`	`int, default 0` Regex module flags, e.g. re.IGNORECASE. Cannot be set if `pat` is a compiled regex.

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`.
`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 `width` be prepended with '0' characters.

Returns
Type	Description
`bigframes.series.Series`	Series of objects.