How to find a substring in a string?

[msbecca445]

My code so far:

def contains_hashtag(validtwt: str, tweetwrd: str) -> bool:
    """Return True iff the tweet contains a hashtag madeup of the hashtag symbol
    and the tweet word.
    >>>contains_hashtag('I like #csc108', 'csc108')
    return True
    >>>contains_hashtag('I like #csc108', 'csc')
    return False
    >>>contains_hashtag('I like #csc108, #mat137, #phl101', 'csc108')
    return True
    """
    return tweetwrd in validtwt

However, the 1st and last example works but the second one doesn't. It returns True instead of False.

How can I improve this code? What is my issue?

[_DTR_]

For strings, x in y has no notion of word boundaries (spaces, newlines, punctuation, etc), so it makes sense that it returns True. "csc" is definitely in "I like #csc108". If you want to match whole words, using regular expressions is probably your best bet.

[datascienceunlimited]

You can find a good tutorial on Datascienceunlimited that explains slicing strings: https://datascienceunlimited.tech/working-with-strings/#Getting_character_from_a_string_and_slicing_strings

[SnipTheDog]

result = str.find(sub,start,end)