![How to convert Upper case into Lowercase letter and vice versa in python || python tutorial #12 - YouTube How to convert Upper case into Lowercase letter and vice versa in python || python tutorial #12 - YouTube](https://i.ytimg.com/vi/onm_oSJ10V0/maxresdefault.jpg)
How to convert Upper case into Lowercase letter and vice versa in python || python tutorial #12 - YouTube
![How Can We Test if a Letter in a String is Uppercase or Lowercase in Python programming language - YouTube How Can We Test if a Letter in a String is Uppercase or Lowercase in Python programming language - YouTube](https://i.ytimg.com/vi/byCBj51JOjk/maxresdefault.jpg)
How Can We Test if a Letter in a String is Uppercase or Lowercase in Python programming language - YouTube
How to write a Python function that accepts a string and calculate the number of upper case letters and lower case letters - Quora
![How to capitalize the first letter of a string with python and other uses of capitalize() function | ВКонтакте How to capitalize the first letter of a string with python and other uses of capitalize() function | ВКонтакте](http://sun9-48.userapi.com/impg/c858528/v858528193/17f898/7KkCnH6yHFA.jpg?size=913x457&quality=96&sign=7586393e8a920886b7c4a9235c4bd07e&type=album)