Python program to count the number of characters (character frequency) in a string.py

def char_frequency(str1):  
    dict = {}  
    for n in str1:  
        keys = dict.keys()  
        if n in keys:  
            dict[n] += 1  
        else:  
            dict[n] = 1  
    return dict  
print(char_frequency('google.com'))