check if variable is dataframe

Question

when my function f is called with a variable I want to check if var is a pandas dataframe:

def f(var):

    if var == pd.DataFrame():

        print "do stuff"

I guess the solution might be quite simple but even with

def f(var):

    if var.values != None:

        print "do stuff"

I can't get it to work like expected.

Answer 1

Use the built-in isinstance() function:

import pandas as pd

def f(var):

    if isinstance(var, pd.DataFrame):

        print("do stuff")