#!/usr/bin/env python2
# -*- coding: utf-8 -*-

def is_numeric(a):
    for i in a:
        if not(isinstance(i,int)) and not(isinstance(i,float)):
            return False
    return True

print(is_numeric([10,20,30]))
print(is_numeric([10.9,20.4,30]))
print(is_numeric(['abc','def',10]))