TheAlgorithms / Python

* Removed an extra '=' which was creating an error while running a program.

* Removed the unexpected expression part.

* Added program for swap cases in string folder

* removed if condition and exchange word with char

* added '=' sign which I removed before because of unknowing error from pycharm

* added space in test

* removed costraint from problem statement

* Update cocktail_shaker_sort.py

* Update naive_string_search.py

* Update swap_case.py

* psf/black " not '

* added new line at the end of the file

* Fix flake8 issues

* added new line at the end of the file

* added True and fixed comment

* python file end with \n

* Update swap_case.py

* Update strings/swap_case.py

* Update strings/swap_case.py

* Apply suggestions from code review

* Update strings/swap_case.py

* Update swap_case.py

* Update swap_case.py

Co-authored-by: Christian Clauss <cclauss@me.com>