Round each number in a Python pandas data frame by 2 decimals

This works `p_table.apply(pd.Series.round)` however it has no decimal places Documentation says ``` import pandas as pd Series.round(decimals=0, out=None) ``` i tried this `p_table.apply(pd.Series.round(2))` but get this error: ``` unbound method round() must be called with Series instance as first argument (got int instance instead) ``` How do I round all elements in the data frame to two decimal places?