mars.dataframe.Series.str.startswith

Series.str.startswith(pat, na=None)

Test if the start of each string element matches a pattern.

Equivalent to str.startswith().

Parameters

• pat (str) – Character sequence. Regular expressions are not accepted.

• na (object, default NaN) – Object shown if element tested is not a string. The default depends on dtype of the array. For object-dtype, numpy.nan is used. For StringDtype, pandas.NA is used.

Returns

A Series of booleans indicating whether the given pattern matches the start of each string element.

Return type

Series or Index of bool

See also

str.startswith

Python standard library string method.

Series.str.endswith

Same as startswith, but tests the end of string.

Series.str.contains

Tests if string element contains a pattern.

Examples

>>> import mars.tensor as mt
>>> import mars.dataframe as md
>>> s = md.Series(['bat', 'Bear', 'cat', mt.nan])
>>> s.execute()
0     bat
1    Bear
2     cat
3     NaN
dtype: object

>>> s.str.startswith('b').execute()
0     True
1    False
2    False
3      NaN
dtype: object

Specifying na to be False instead of NaN.

>>> s.str.startswith('b', na=False).execute()
0     True
1    False
2    False
3    False
dtype: bool

mars.dataframe.Series.str.rsplit mars.dataframe.Series.str.strip