Do all of this in a .py file in Pycharm:
Create a variable called mixed_case and assign it the string "A Song of Ice and Fire"
Use .isupper() to check if mixed_case is a string of all upper case letters. print() the result.
Use .islower() to check if mixed_case is a string of all lower case letters. print() the result.
Change all of the letters in mixed_case to upper case letters using .upper() and print() the result.
Change all of the letters in mixed_case to lower case letters using .lower() and print() the result.
Use the .istitle() method to check if mixed_case is title case and print the result.
Create a variable called title_case and assign it the result of .title() being called on mixed_case.
print() title_case
Call startswith() on mixed_case with the letter mixed_case starts with as its argument. print() the result.
Call endswith() on mixed_case with the letter mixed_case ends with as its argument. print() the result.
Create a variable called words and assign it the result of split() being used on mixed_case.
print the variable "words"
Use the .join() method to join together all of the items in the list assigned to words as a single string. Use .isalpha() to check if the string is made up entirely of letters. Finally, use print() to display the result.