将尾随零添加到小数位

Question

I have a dataframe column where numerical data is stored (in thousands) with a '.' signifying a thousands separator. The initial input file lacks trailing zeros, and a trailing decimal places are needed (to a maximum of 3). Whole numbers should remain the same.

Please find a snippet of the dataframe df below.

Input Data

Product     Quantity 
ABC         1
ZXC         2.1
QWE         3.21
ASD         4.123

Expected output

Product     Quantity 
ABC         1
ZXC         2.100
QWE         3.210
ASD         4.123

Any assistance that anyone could provide would be greatly appreciated.

Answer 1

You can change float display format in a following way:

pd.options.display.float_format = '{:,.3f}'.format

If you don't want integers to be formatted, use following:

pd.options.display.float_format = lambda x: '{:,.0f}'.format(x) if float(x.is_integer()) else '{:,.3f}'.format(x)