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Python Python Collections (2016, retired 2019) Lists Disemvowel

Can you explain me what I am doing wrong?


Can you please explain me what I am doing wrong and how I should correct it?

Best regards, Robert

def disemvowel(word):

    vowels = [ "A", "a", "E", "e" , "I", "i", "O", "o", "U", "u"]
    for letters in word:
        if letters in vowels:
    return word

What error are you getting?

2 Answers

Umesh Ravji
Umesh Ravji
42,386 Points

Hi Robert,

The problem here is you are trying to call the remove method on a string. The string class doesn't have a remove method (strings in python are immutable). The best way would be to convert the word into a list, so you can then call remove on it.

Removing items in a list isn't always straightforward, and you should start from the end to ensure that all the items are removed.

def disemvowel(word):
    word_list = list(word)
    vowels = ["A", "a", "E", "e", "I", "i", "O", "o", "U", "u"]
    for letter in reversed(word_list):
        if letter in vowels:
    return ''.join(word_list)

I would suggest iterating over a copy of the list. Your solution works here but might not be a good general pattern in situations where you're not necessarily removing all occurrences of a particular item.

As an alternative solution, you can avoid the list conversions and remove method by building up a new string of consonants using string concatenation.

Hello Umesh,

Thank you for answer - that all makes sense. However can you please explain to me in more details why we should start from the end? In my opinion if we are iterating each letter it should makes no difference.

Opanin Akuffo
Opanin Akuffo
4,713 Points

How come this does not work in challenge but works on workspaces. Nothing seems wrong to me. Please help.

def disemvowel(word):
  vowels = ['a', 'e', 'i', 'o', 'u']
  guy = list(word.lower())
  for vowel in guy[:]:
    if vowel in vowels:
  return ("".join(guy))

It's because you're lowercasing the entire word and not maintaining what was passed in.

You should either add the upper-case vowels to your list. Or lower-case the individual letters when doing your if check.