main.py

#!/usr/bin/env python3
# _*_ coding=utf-8 _*_

import argparse
import code
import signal
import sys
import math


def SigHandler_SIGINT(signum, frame):
    print()
    sys.exit(0)


class Argparser(object):
    def __init__(self):
        parser = argparse.ArgumentParser()
        parser.add_argument("--string", type=str, help="string")
        parser.add_argument("--bool", action="store_true",
                            help="bool", default=False)
        parser.add_argument("--dbg", action="store_true",
                            help="debug", default=False)
        self.args = parser.parse_args()

# write code here


def premain(argparser):
    signal.signal(signal.SIGINT, SigHandler_SIGINT)
    # here
    a = input("please enter a:")
    b = input("please enter b:")
    c = input("please enter c:")
    a = int(a)
    b = int(b)
    c = int(c)

    if a == 0:
        print("not a second degree polynominal")
        sys.exit(1)

    if b*b > 4*a*c:
        root1 = (-b-math.sqrt(b*b-4*a*c))/2/a
        root2 = (-b+math.sqrt(b*b-4*a*c))/2/a
        print("root1: ", root1, " root2: ", root2)
    else:
        print("roots will have imaginary parts")


def main():
    argparser = Argparser()
    if argparser.args.dbg:
        try:
            premain(argparser)
        except Exception as e:
            if hasattr(e, "__doc__"):
                print(e.__doc__)
            if hasattr(e, "message"):
                print(e.message)
            variables = globals().copy()
            variables.update(locals())
            shell = code.InteractiveConsole(variables)
            shell.interact(banner="DEBUG REPL")
    else:
        premain(argparser)


if __name__ == "__main__":
    main()