A trick to test input type str.isalpha() str.isalnum()
For example 'a'.isalpha() == True -> True, '5'.isalpha() == True -> False
isalpha() only returns true if the string is completely alphabetical.
numbers need to use isalnum() which refers to is alpha numerical
More string type tricks here https://docs.python.org/3/library/stdtypes.html including how to check for spaces.
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