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magnus@XPS-12:~/Documents/src/python$ ./fib.py
('Please specify a limit. E.g. "fib.py 13"', IndexError('list index out of range',))
magnus@XPS-12:~/Documents/src/python$ ./fib.py sdf
('Please specify a limit. E.g. "fib.py 13"', ValueError("invalid literal for int() with base 10: 'sdf'",))