A Python tool I made

#!/usr/bin/python
# -*- coding: utf-8 -*-

import time
import math
import subprocess as sp
import json
import urllib
import platform
import sys
import smtplib

os = platform.system()
pcname = platform.node()


def main():
    cls()
    print("1) Calculator")
    print("2) IP Tools")
    print("3) Binary")
    sin = input('>>> ')
    if sin == 1:
        calc()
    if sin == 2:
        ipt()
    if sin == 3:
        bint()

def calc():
    def add():
        cls()
        print("Type Number 1")
        n1 = input(">>> ")
        print("Type Number 2")
        n2 = input(">>> ")
        tot = n1+n2
        print(str(n1)+" + "+str(n2)+" = "+str(tot))
    def sub():
        cls()
        print("Type Number 1")
        n1 = input(">>> ")
        print("Type Number 2")
        n2 = input(">>> ")
        tot = n1-n2
        print(str(n1)+" - "+str(n2)+" = "+str(tot))
    def mul():
        cls()
        print("Type Number 1")
        n1 = input(">>> ")
        print("Type Number 2")
        n2 = input(">>> ")
        tot = n1*n2
        print(str(n1)+" x "+str(n2)+" = "+str(tot))
    def div():
        cls()
        print("Type Number 1")
        n1 = input(">>> ")
        print("Type Number 2")
        n2 = input(">>> ")
        tot = n1/n2
        r = n1%n2
        print(str(n1)+" / "+str(n2)+" = "+str(tot)+" R"+str(r))
    cls()
    print '1) Addition'
    print '2) Subtraction'
    print '3) Multiplacation'
    print '4) Division'
    cin = input('>>> ')
    if cin == 1:
        add()
    if cin == 2:
        sub()
    if cin == 3:
        mul()
    if cin == 4:
        div()


def ipt():
    cls()
    print "1) Whats my IP"
    print "2) IP to Location"
    ipti = input('>>> ')

    if ipti == 1:
        cls()
        ip = urllib.urlopen('http://www.networksecuritytoolkit.org/nst/tools/ip.php').read()
        print('Your IP is '+ip)
        rq()

    if ipti == 2:
        cls()
        print("1) My Location")
        print("2) IP to Location")

        uin = input(">>> ")

        if uin == 1:
            cls()
            ip = urllib.urlopen("http://www.networksecuritytoolkit.org/nst/tools/ip.php").read()
            jipd = "http://ipinfo.io/"+ip+"/geo"
            jd = json.load(urllib.urlopen(jipd))
            print("You live in "+jd["city"]+", "+jd["region"]+" "+jd["country"])
            rq()
        if uin == 2:
            cls()
            print("Type IP to get Location of ")
            ip = raw_input(">>> ")
            jipd = "http://ipinfo.io/"+ip+"/geo"
            jd = json.load(urllib.urlopen(jipd))
            print("You live in "+jd["city"]+", "+jd["region"]+" "+jd["country"])
            rq()

def bint():
    cls()
    print("1) Binary to text")
    print("2) Text to binary")
    uin = input(">>> ")

    if uin == 1:
        cls()
        print("Binary to convert")
        binaryt = input(">>> ")
        print(''.join(chr(int(binaryt[i:i+8], 2)) for i in xrange(0, len(bin_text), 8)))
        rq()
    if uin == 2:
        cls()
        print("Text to convert")
        raw = raw_input(">>> ")
        print(''.join('{:08b}'.format(ord(c)) for c in raw))
        rq()

def rq():
    cls()
    print 'Do you want to restart?(y/n)'
    gbq = raw_input('>>>')
    a = gbq.lower
    cls()
    if a == 'y' or 'yes':
        start()
    if a == 'n' or 'no':
        import sys
        print 'Exiting'
        sys.exit(0)
        exit()

def cls():
    if os == 'Windows' or 'Vista' or 'XP':
        sp.call('cls', shell=True)
    elif os == 'Linux' or 'Linux2' or 'Darwin':
        sp.call('clear', shell=True)
    else:
        print '\nUnable to clear screen!'


main()