You can use char in "aeiouAEIOU"
to determine if a character is a vowel, and use a list comprehension
to produce a list containing only vowels, and find the number of vowels in the input string by finding the length of this list.
string=raw_input()
numOfVowels=len([char for char in string if char in "aeiouAEIOU"])
print(numOfVowels)
Input:
abcdefghijklmnopqrstuvwxyz
Output:
5
solved Use the method is_vowel