PYTHON CONSOLE CALCULATOR

calculator.py

"""
Functions available are:
--------------------------------------------
     + : addition
     - : subtraction
     * : multiplication
     / : division
     % : percentage
"""
import sys
import math


def calc(term):
    # input: term of type str
    # output: returns the result of the computed term.
    # purpose: This function is the actual calculator and the heart of the application

    term = term.replace(' ', '')
    term = term.replace('^', '**')
    term = term.replace('=', '')
    term = term.replace('?', '')
    term = term.replace('%', '/100.00')

    term = term.lower()

    try:
        term = eval(term)
    except ZeroDivisionError:
        print("Can't divide by 0.  Please try again.")
    except SyntaxError:
        print("Syntax Error")
    except NameError:
        print('Invalid input.  Please try again')
    except AttributeError:
        print('Please check usage method and try again.')
    except TypeError:
        print("please enter inputs of correct datatype ")
    return term


def result(term):
    print("\n" + str(calc(term)))


def main():
    msg = """Functions available are:
--------------------------------------------
     + : addition
     - : subtraction
     * : multiplication
     / : division
     % : percentage
"""
    print(msg)
    print("For Example: What is 10+10-12\n\nEnter quit to exit")

    while True:
        k = input("\nWhat is ")
        if k == 'quit' or k == 'exit' or k == 'q':
            break
        result(k)


if __name__ == '__main__':
    main()