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Pandas Series str | center method

schedule Aug 12, 2023
Last updated
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Pandas Series.str.center(~) pads the left and right side of each string in the Series until the specified width is reached. If the length of the string is larger than the specified width, then the string is left as is.

WARNING

If the value is not of type string, then NaN will be returned for that value. If all the values are not of type string, then an error will be thrown.

Parameters

1. width | int

The desired length to pad until.

2. fillchar | string

The character to pad with. By default, fillchar=" " (whitespace).

Return Value

A Series.

Examples

Basic usage

To center pad each value to a width of 4:

s = pd.Series(["ab", "2", 2, pd.np.nan])
s.str.center(width=4, fillchar="A")
0 AabA
1 A2AA
2 NaN
3 NaN
dtype: object

Here, note the following:

  • the value 2 turned into NaN - this is because the method turns non-string values to NaN.

  • though not officially documented, for uneven cases, the fill character is added to the right side.

Overflow case

When the length of a string is larger than the specified width, it is left as is:

s = pd.Series(["aaaaa", "aa"])
s.str.center(width=4, fillchar="A")
0 aaaaa
1 AaaA
dtype: object
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Published by Isshin Inada
Edited by 0 others
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