Removing items for a list using a loop in Python

Question

I am very new to programming in general and have started with Python. I am working through various problems to try and better my understanding.

I am trying to defin

Answer 1

You seem to have approached this a bit backwards. Firstly, note that:

new = []
for i in range(len(text)):
    new.append(text[i])

is just:

new = list(text)

Secondly, why not check before appending, rather than afterwards? Then you only have to iterate over the characters once. This could be:

def anti_vowel(text):
    """Remove all vowels from the supplied text.""" # explanatory docstring
    non_vowels = [] # clear variable names
    vowels = set("aeiouAEIOU") # sets allow fast membership tests
    for char in text: # iterate directly over characters, no need for 'i'
        if char not in vowels: # test membership of vowels
            non_vowels.append(char) # add non-vowels only
    return "".join(non_vowels)

A quick example:

>>> anti_vowel("Hey look words!")
'Hy lk wrds!'

This simplifies further to a list comprehension:

def anti_vowel(text):
    """Remove all vowels from the supplied text."""
    vowels = set("aeiouAEIOU")
    return "".join([char for char in text if char not in vowels])