CODEWITHSUNDEEP
python
Ryan
Ryan

Reputation: 19

For loop function not returning the correct output

I'm trying to write a program to see how many times a 3-digit substring shows up in a string. For example, the substring "122" would show up in the string "122122" 2 times. However, whenever I run it, it returns 0, even if the substring does actually show up. Can you tell me what's wrong with my function?

def count_substring(string, sub_string):
    count = 0
    for i in range (len(string)): 
        if string[i:i+3] == sub_string:
           count+=1

Upvotes: 0

Views: 45

Answers (2)

Kevin
Kevin

Reputation: 141

Using @Samwise's comment as a suggestion:

def count_substring(string, sub_string):
    return string.count(sub_string)

Although, since that's a one-liner, if you only need to run this function once, you may not even want to break it off into its own function. So just use string.count(sub_string) where you need it.

Upvotes: 1

berkayln
berkayln

Reputation: 995

This can help you:

def count_substring(string, sub_string):
    return string.count(sub_string)

Upvotes: 0

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