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Adding leading zeros to strings of a column in Pandas

Pandas
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Data Manipulation Cookbook
schedule Jul 1, 2022
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To add leading zeros to strings of a column in Pandas, use the Series' str.zfill(~) method.

Example

Consider the following DataFrame:

df = pd.DataFrame({"A":["12","345","6789","AAAAA",np.nan]})
df
A
0 12
1 345
2 6789
3 AAAAA
4 NaN

To add leading zeros to each string of column A until a width of 4 is reached:

df["A"] = df["A"].str.zfill(4)
df
A
0 0012
1 0345
2 6789
3 AAAAA
4 NaN

Here, note the following:

  • values that are longer than the specified width are left intact (e.g. "AAAAA").

  • NaN values are also left as is.

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Published by Isshin Inada
Edited by 0 others
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