Python

#Replace NaN Values with Zeros in Pandas DataFrame
#For a single column using Pandas
df['column-name'] = df['column-name'].fillna(0)

f_num.strip().zfill(2)

>>> n = '4'
>>> print(n.zfill(3))
004

# apply to pandas dataframe column
df['column'].apply(lambda x: str(x).zfill(11))

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