Python 3
A simple way to encrypt a file is to change all characters
following a certain encoding rule. In this question, you need to
move all letters to next letter. e.g. 'a'->'b', 'b'->'c',
..., 'z'->'a', 'A'->'B', 'B'->'C', ..., 'Z'->'A'. For
all digits, you need to also move them to the next number. e.g.
'0'->'1', '1'->'2', ..., '9'->'0'. All the other symbols
should not be changed.
Write a function encrypt with the following requirements:
the function takes a string argument,...