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

If you want "." as thousand separator and "," as decimal separator this will works:

Data = pd.read_Excel(path)

Data[my_numbers] = Data[my_numbers].map('{:,.2f}'.format).str.replace(",", "~").str.replace(".", ",").str.replace("~", ".")

If you want three decimals instead of two you change "2f" --> "3f"

Data[my_numbers] = Data[my_numbers].map('{:,.3f}'.format).str.replace(",", "~").str.replace(".", ",").str.replace("~", ".")