Using for loop in Python to add leading zeros to date column

Here you go (without loop):

df["Month"] = df.Month.map("{:02}".format)

python pandas for-loop leading-zero

You can try this:

df = pd.read_csv('file.csv', converters={'Month': '{:0>2}'.format}).astype('str')print(df)

python pandas for-loop leading-zero

df['Month'].astype(str).str.zfill(2)

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