Removing all consonants from a string in Python

In this article, we will explore various ways in which we can remove all the consonants from a given string in Python.

The simplest way would be to convert a string to a list and replace the character with ‘0’ if it’s not a vowel and combine all the non-zero elements. Here we are converting the string to list to replace the element with zero because strings are immutable.

def removeCons(s):
    vowel="aeiouAEIOU"
    
    lis=[i for i in s]
    for i in range(len(s)):
        k=0
        for j in range(len(vowel)):
            if(s[i]!=vowel[j]):
                k+=1
        if(k==10):
            lis[i]=0
    s="".join(i for i in lis if(i!=0))
    return(s)

Another way to write the same code is below. Here instead to removing the consonants we added the vowels then joined to characters to form the string.

def removeCons(s):
    vowel="aeiouAEIOU"
    
    lis=[]
    for i in range(len(s)):
        k=0
        for j in range(len(vowel)):
            if(s[i]==vowel[j]):
                k+=1
        if(k!=0):
            lis.append(s[i])
            
            
    s="".join(i for i in lis)
    return s

And the shortest code for the purpose looks like

def removeCons(s):
    lis=[]
    for x in s:
        if i in vowel:
            lis.append(i)
    s="".join(i for i in lis)
    return s

Input:

s="qwertyuioplkjhgfdsazxcvbnm"
print(removeCons(s))

Output:

euioa 

That’s it guys this was a simple tutorial to remove consonants from the string. If you could come up with more efficient code please do comment it.