pandas.Series.str.startswith

Series.str.startswith(pat, na=<no_default>)

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

Equivalent to str.startswith().

Parameters:

patstr or tuple[str, …]

Character sequence or tuple of strings. Regular expressions are not accepted.

nascalar, optional

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 the nullable StringDtype, pandas.NA is used. For the "str" dtype, False is used.

Returns:

Series or Index of bool

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

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

>>> s = pd.Series(["bat", "Bear", "cat", np.nan])
>>> s
0     bat
1    Bear
2     cat
3     NaN
dtype: object

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

>>> s.str.startswith(("b", "B"))
0     True
1     True
2    False
3      NaN
dtype: object

Specifying na to be False instead of NaN.

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