calc.py

#!/usr/bin/env python3

from math import *
import sys

if __name__ == '__main__':
    script = ' '.join(sys.argv[1:]).strip()
    if len(script) > 0:
        print(script, '=', end='')
        result = eval(script)
        print('', '\033[91m' + str(result) + '\033[0m')