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Adding padding to a column of strings in Pandas

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Data Manipulation Cookbook
schedule Jul 1, 2022
Last updated
local_offer PythonPandas
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tocTable of Contents
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To add padding to a column of strings, use the Series' str.pad(~) method.

As an example, consider the following DataFrame:

df = pd.DataFrame({"A":["aa", "bbb", "cccc", "ddddd"]})
df
A
0 aa
1 bbb
2 cccc
3 ddddd

Left-padding

To pad the left side of each string with character "Z" until a width of 4 is reached:

df["A"].str.pad(width=4, fillchar="Z") # side="left"
0 ZZaa
1 Zbbb
2 cccc
3 ddddd
Name: A, dtype: object

Notice how strings that are longer than the specified width are left as is.

Right-padding

To pad the right-side instead, just set side="right" like so:

df["A"].str.pad(width=4, fillchar="Z", side="right")
0 aaZZ
1 bbbZ
2 cccc
3 ddddd
Name: A, dtype: object

Padding both ends

To pad both ends, set side="both" like so:

df["A"].str.pad(width=4, fillchar="Z", side="both")
0 ZaaZ
1 bbbZ
2 cccc
3 ddddd
Name: A, dtype: object
robocat
Published by Isshin Inada
Edited by 0 others
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