CODEWITHSUNDEEP
pythonstringlist
Young Ma
Young Ma

Reputation: 45

How to remove certain strings from a list in python

If I have a list similar to

mylist = ["danny","florence","micheal","klrv","yrcv"]

And I want to remove the strings that do not have vowels in them and put them in a new list, resulting in me have two lists. How do I do it?

I tried coding it manually

mylist_no_vowel = ["klrv","yrcv"]

Then using .remove to make original list smaller. But I feel there is a code to automate it instead of doing it manually.

Upvotes: 0

Views: 302

Answers (2)

evenodd
evenodd

Reputation: 317

The following codes should serve the purpose.

mylist = ["danny", "florence", "micheal", "klrv", "yrcv"]

mylist_no_vowel = list(filter(lambda x: set('aeiou') & set(x)==set(), mylist))

print(mylist_no_vowel)

Here is the result, which is the same as your expected result:

['klrv', 'yrcv']

The idea is to use the anonymous function to filter out each element x of mylist that contains vowels via keeping each element x of mylist such that the intersection of set(x) and set('aeiou') is the empty set set().

Upvotes: 2

jfaccioni
jfaccioni

Reputation: 7509

The quick-and-dirty one-liner is:

mylist = ["danny","florence","micheal","klrv","yrcv"]
mylist_no_vowel = [word for word in mylist if not any(character in 'aeiou' for character in word)]

Explanation

The second line uses a syntax called a list comprehension, which is a Python idiom for building a list (in this case, by filtering another list). The code is equivalent to:

mylist = ["danny","florence","micheal","klrv","yrcv"]
mylist_no_vowel = []

for word in mylist:
    if not any(character in 'aeiou' for character in word):
        mylist_no_vowel.append(word)

Translating, we start an empty list called mylist_no_vowel, then we iterate through each word in the original list mylist. For each word, we check if any of their characters is a vowel, using the any function. If that's not the case, we add the word to the mylist_no_vowel list.

Note that I changed your starting list variable name from list to mylist, since list is actually a reserved word in Python - you're overwriting the built-in list function by naming a variable like that!

Upvotes: 4

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