Calcy.py

# -*- coding: utf-8 -*-
"""
Created on Mon Jul  6 23:26:25 2020

@author: Avinash Ranjan
"""

import re

print("Magical Calculator")
print("Type 'quit' to exit\n")

previous = 0
run = True


def performMath():
    global run
    global previous
    equation = ""
    if previous == 0:
        equation = input("Enter Equation:")
    else:
        equation = input(str(previous))

    if equation == 'quit':
        print("GoodBye, Human..!")
        run = False

    else:
        equation = re.sub('[a-zA-Z,:()"{}"]', '', equation)

        if previous == 0:
            previous = eval(equation)
        else:
            previous = eval(str(equation) + equation)


while run:
    performMath()