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

Assuming you just want to display (or render to html) the floats/integers with a thousands separator you can use styling which was added in version 0.17.1:

import pandas as pd
df = pd.DataFrame({'int': [1200, 320], 'flt': [5300.57, 12000000.23]})

df.style.format('{:,}')

To render this output to html you use the render method on the Styler.