Website & File Launcher + Calculator version 0.0.8

#Python Launcher version 0.0.8
#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

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 'exit' to close the program!")
    blank()
    print ("    *Type 'math' to do basic math operations!")
    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()
    else:
        print ("Sorry, unknown command!")
        blank()


#Changelog:
        # -Very quick update: Exponents added!


#Other changes from 0.0.7:

        # -Math operators added :) .
        # -Overhauled code! (made everything better :D)
        # -Again, better UI.
        # -More operations and file shortcuts coming soon!