Python Program to Count Vowels in a String
mediumStringsPython
A for loop can walk through a string one character at a time — here it counts the vowels.
The question
Read a sentence and print how many vowels (a, e, i, o, u — upper or lower case) it contains.
The code
program.py
s = input()
count = 0
for ch in s.lower():
if ch in "aeiou":
count += 1
print("Vowels =", count)Input
Things Module Arduino Pao of
Output
Vowels = 11
How it works
- 1s.lower() makes capital vowels count too.
- 2for ch in ... visits every character, including spaces.
- 3Whenever ch is in "aeiou", add 1 to count.
Common mistakes
- Forgetting capital letters — "Internet" then has one vowel too few.
- Resetting count = 0 inside the loop.
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