PythonOS

__author__ = 'Brad'
import time
import os

#This requires that you be running windows. Any other os will make errors.
#you need a text file called "pass" in the same directory as this python file with your password #typed in it
def calc():
    os.system("cls")
    function = raw_input("add, subtract, multiply, or divide?: ")
    if function == "add":
        os.system("cls")
        x = raw_input("Insert first number: ")
        os.system("cls")
        y = raw_input("Insert second number: ")
        os.system("cls")
        add = int(x) + int(y)
        print(str(x) + " + " + str(y) + " = " + str(add))
        osScreen2()
    elif function == "subtract":
        os.system("cls")
        x = raw_input("Insert first number: ")
        os.system("cls")
        y = raw_input("Insert second number: ")
        os.system("cls")
        add = int(x) - int(y)
        print(str(x) + " - " + str(y) + " = " + str(add))
        osScreen2()
    elif function == "multiply":
        os.system("cls")
        x = raw_input("Insert first factor: ")
        os.system("cls")
        y = raw_input("Insert second factor: ")
        os.system("cls")
        add = int(x) * int(y)
        print(str(x) + " x " + str(y) + " = " + str(add))
        osScreen2()
    elif function == "divide":
        os.system("cls")
        x = raw_input("Insert numerator: ")
        os.system("cls")
        y = raw_input("Insert denominator: ")
        os.system("cls")
        add = int(x) / int(y)
        print(str(x) + " / " + str(y) + " = " + str(add))
        osScreen2()
    else:
        print("Invalid operation")
        osScreen2()


# the say command-------------------------
def say():
    sent = raw_input("Say what?: ")
    print(sent)
    osScreen2()
#--------------------------the resetpw command--------------------------
def pwreset():
    os.system("cls")
    ps = raw_input("Enter your old password: ")
    if ps == password:
        os.system("cls")
        dp = raw_input("Enter your new password: ")
        open("pass.txt", 'w').close
        f2 = open("pass.txt", "r+")
        f2.write(dp)
        os.system("cls")
        print("Password Reset")
        time.sleep(1)
        os.system("cls")
        osScreen2()
    else:
        os.system("cls")
        print("Passcode Incorrect")
        time.sleep(1)
        osScreen()
#--------------------------------------------------------------------------
#---------------the coms command-------------------------------------------
def commands():
    print("commands: exit, resetpw, coms, clearsc, say, calc")
# -------------------the loading account screen ----------------------------
def loadOS():
    os.system("cls")
    print("loading your POS account.")
    time.sleep(1)
    os.system("cls")
    print("loading your POS account..")
    time.sleep(1)
    os.system("cls")
    print("loading your POS account...")
    time.sleep(1)
    osScreen()
#------------------------------------------------------------------------------
#---------------the command interpreter----------------------------------------
def osScreen():
    os.system("cls")
    print("POS V 0.0.1")
    print("for a list of commands type 'coms'")
    osScreen2()
def osScreen2():
    command = raw_input("> ")
    if command == "exit":
        exit()
    elif command == "resetpw":
        pwreset()
        osScreen2()
    elif command == "coms":
        commands()
        osScreen2()
    elif command == "clearsc":
        os.system("cls")
        osScreen2()
    elif command == "say":
        say()
    elif command == "calc":
        calc()
    else:
        print("Unknown command")
        osScreen2()

print("Welcome to POS")
print("--------------")
password = raw_input("Code: ")
f1 = open("pass.txt")
setpass = f1.read()
f1.close()
if password == setpass:
    loadOS()
else:
    print("Incorrect Passcode")