replace vowels

[buran]

or

def replace_vowel(word):
    vowels = 'aeiouAEIOU'
    for vowel in vowels:
        word = word.replace(vowel,'-')
    return word

list1 = ['john', 'tony', 'luck', 'o', 'mIssissippi']
print(map(replace_vowel, list1))

Output:
['j-hn', 't-ny', 'l-ck', '-', 'm-ss-ss-pp-']