Easy way to add thousand separator to numbers in Python pandas DataFrame

Question

Assuming that I have a pandas dataframe and I want to add thousand separators to all the numbers (integer and float), what is an easy and quick way to do it?

Answer 1

Use Series.map or Series.apply with this solutions:

df['col'] = df['col'].map('{:,}'.format)
df['col'] = df['col'].map(lambda x: f'{x:,}')

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df['col'] = df['col'].apply('{:,}'.format)
df['col'] = df['col'].apply(lambda x: f'{x:,}')