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Adding leading zeros to strings of a column in Pandas
schedule Aug 11, 2023
Last updated local_offer
Tags Python●Pandas
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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
A0 121 3452 67893 AAAAA4 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
A0 00121 03452 67893 AAAAA4 NaN
Here, note the following:
values that are longer than the specified width are left intact (e.g.
"AAAAA").NaNvalues are also left as is.
Published by Isshin Inada
Edited by 0 others
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