count substring in string python

1str_x = "He is a good programmer. He Is good. He is he he he he he " 
2
3count1 = str_x.count("He") # Counts the word "He" in the string. Remember, case sensitive!
4count2 = str_x.count("he") #Counts the word "he" in the string. Remember, case sensitive!
5
6print(count1 + count2) # Shows the total count of the word "He" in console

1def count_substring(string, sub_string):
2    c = 0
3    while sub_string in string:
4        c += 1           
5        string = string[string.find(sub_string)+1:]
6    return c
7

1count = string.count(substring)

1def count_substring(string,sub_string):
2    l=len(sub_string)
3    count=0
4    for i in range(len(string)-len(sub_string)+1):
5        if(string[i:i+len(sub_string)] == sub_string ):      
6            count+=1
7    return count  
8