Python Control Center & Launcher version 0.1.0 beta

#Python Control Center version 0.1.0 beta
#Coded by GameNationRDF
#It will be updated frequently with bug fixes and new feautures!
import webbrowser
import sys
import os
import string
import time
import math

currentVersion = ("0.1.0 beta")
developer = ("Umut Bilgic")
year = ("2013")

def blank():
    print (" ")

def intro():
    print ("Here are the things you can do: ")
    blank()
    print ("    *Type the website and hit enter to launch that website!")
    blank()
    print ("    *Type 'file', and write the location of a file/program to launch it!")
    blank()
    print ("    *Type 'math' to do basic math operations!")
    blank()
    print ("    *Type 'time' to set up a timer!")
    blank()
    print ("    *Type 'info' to get info about the program.")
    blank()
    print ("    *Type 'exit' to close the program!")
    blank()


intro()

while True:
    userIn=str(input("Enter address/command here: "))
    blank()
    if userIn == ("exit"):
        print ("Program will close in a second..")
        time.sleep(1)
        sys.exit()
    elif userIn == ("file"):
        filename=str(input("    *Enter file place: "))
        os.system("start "+filename)
    elif userIn.startswith("www") is True:
        handle=webbrowser.get()
        handle.open(userIn)
    elif userIn == ("math"):

        operation = str(input("Enter operation (+, -, *, /, sqrt, exp): "))
        blank()

        if operation == ("+"):
            input_1 = int(input("   *Enter first number:  "))
            input_2 = int(input("   *Enter second number: "))
            print ((input_1)+(input_2))
            blank()
        elif operation == ("-"):
            input_1 = int(input("   *Enter first number:  "))
            input_2 = int(input("   *Enter second number: "))
            print ((input_1)-(input_2))
            blank()
        elif operation == ("*"):
            input_1 = int(input("   *Enter first number:  "))
            input_2 = int(input("   *Enter second number: "))
            print ((input_1)*(input_2))
            blank()
        elif operation == ("/"):
            input_1 = int(input("   *Enter first number:  "))
            input_2 = int(input("   *Enter second number: "))
            print ((input_1)/(input_2))
            blank()
        elif operation == ("exp"):
            input_1 = int(input("   *Enter first number:  "))
            input_2 = int(input("   *Enter second number: "))
            print ((input_1)**(input_2))
            blank()
        elif operation == ("sqrt"):
            oneInput = int(input("  *Enter number: "))
            print (math.sqrt(oneInput))
            blank()

    elif userIn == ("info"):
        print (" - Current Version: "+currentVersion)
        print (" - Developer: "+developer)
        print (" - "+year)
    elif userIn == ("time"):
        userTimeMode = str(input("  *Minutes or Seconds? (m/s): "))
        blank()
        if userTimeMode == ("m"):
            userLimitMin = int(input("  *Set your timer (minutes): "))
            blank()
            userLimit = (userLimitMin * 60)
        else:
            userLimit = int(input("    *Set your timer (seconds): "))
            blank()
        userMode  = str(input("    *Display mode? (y/n): "))
        blank()
        for i in range(1, userLimit):
            if userMode == ("y") or userMode == ("Y"):
                print (i)
            time.sleep(1.0)
        print ("Countdown finished!")
        blank()

    else:
        print ("Sorry, unknown command!")
        blank()


#Changelog:
        # -Beta is here!
        # -Timer mode added! Set a timer in minutes or seconds!
        # -Info added.
        # -Derpy herps fixed. (Exponent function was not working properly)
        # -Program name is more accurate :)