Calculator CLI App
Sample runs of calculator.py (fixed) File: /mnt/data/calculator.py
$ python3 /mnt/data/calculator.py 2+3*4 14
$ python3 /mnt/data/calculator.py 10/3 3.3333333333333335
$ python3 /mnt/data/calculator.py -(5+2)**2 -49
$ python3 /mnt/data/calculator.py 2*(3+4)/7 2
$ python3 /mnt/data/calculator.py 5//2 2