Example to use of string method in python

stringUtilities.py

'''
A collection of method to manipulate string object in python.

The str object is a sequence, other example of sequence are: bytes, bytesarray, list, tuple, range

'''
def loToUpAndUpToLo(inputString):
  '''
  Switch the lowercase character to uppercase and uppercase to lowercase.
  
  Create a list as a copy of the string and then iterate into character to check and transformate it.
  
  Args:
    inputString(str): The string to convert.

  Returns:
    str: The return value.
 '''
  stringAsList=list(inputString)
  for i,c in enumerate(stringAsList):
    if c.islower():
      stringAsList[i]=c.upper()
    elif c.isupper():
      stringAsList[i]=c.lower()
  return "".join(stringAsList)


stringToTest="tEsT"

print("Try function to swap case, it works? ",stringToTest.swapcase()==loToUpAndUpToLo(stringToTest))