Check numeric values from a dictionary by unit test

I have a function

read_value_from_text()

that reads parameters from a config file and returns a dictionary in this form

{ key1 : value1, key2 : value2, ... , keyn : valuen }

I want to write a unit test that checks if all values (value1,...,valuen) are numeric ( float or integer). Can someone suggest an efficient way to do this?