How to Count Uppercase and Lowercase Letters in a String with Python

In this example we will show how to count the number of uppercase and lowercase characters in a string.

Source Code

#! /usr/bin/env python3
# -*- coding: utf-8 -*-

str = input("Input string：")
countLower = 0
countUpper = 0
for i in str:
    if i.islower():
        countLower += 1
    elif i.isupper():
        countUpper += 1
print("The number of lowercase characters in the string：", countLower)
print("The number of uppercase characters in the string：", countUpper)

Output:

Input string：Hello World
The number of lowercase characters in the string： 8
The number of uppercase characters in the string： 2