Python Control Center & Launcher beta 1.3

#Python Control Center version "Beta 1.3"
#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 urllib.request
from math import sqrt
currentVersion = ("Beta 1.3")
developer = ("Umut Bilgic")
year = ("2013")

def halfBlankScreenShort():
    for i in range(10):
        print("")

def halfBlankScreenLong():
    for i in range(24):
        print("")

def blank():
    print ("")

def helpF():

    st1=("Here are the things you can do: ")
    st2=("    * Type the website and hit enter to launch that website!")
    st3=("    * Type 'source' and then the URL to view the sourcecode of that website!")
    st3=("    * Type 'file', and write the location of a file/program to launch it!")
    st4=("    * Type 'c' to qucikly launch a file browser under 'file' menu!")
    st5=("    * Type 'math' to do basic math operations!")
    st6=("    * Type 'time' to set up a timer!")
    st7=("    * Type 'ping' to open up the ping menu and ping websites!")
    st8=("    * Type 'info' to get info about the program.")
    st9=("    * Type 'exit' to close the program!")
    introStringList=[st1, st2, st3, st4, st5, st6, st7, st8, st9]
    for i in (introStringList):
        print (i)
        blank()

halfBlankScreenShort()
print ("                             |--------------------|")
print ("                             |  LOADING LAUNCHER  |")
print ("                             |--------------------|")
time.sleep(0.5)
halfBlankScreenLong()

print ("Type 'help' to see what you can do!")
blank()

# --- MAIN LOOP --- #

while True:
    userIn=str(input("Enter address/command here: "))
    blank()

    if userIn == ("help"):
        helpF()

    elif userIn == ("exit"):
        print ("Program will close in a moment..")
        time.sleep(0.7)
        sys.exit()

    elif userIn == ("file"):
        filename=str(input("    * Enter file place: "))
        blank()
        if filename == ("c"):
            c=("C:\ ")
            os.system("start " + c)
        else:
            os.system("start "+filename)

    elif userIn.startswith("www") is True:
        webbrowser.open(userIn)

    elif userIn == ("source"):
        userURL=str(input("    * Enter the URL Address: "))
        print (urllib.request.urlopen(userURL).read())
        blank()

    elif userIn == ("math"):
        op = str(input("    * Enter operation (+, -, *, /, exp, sqrt): "))
        blank()
        if op==("+") or op==("-") or op==("*") or op==("/") or op==("exp"):
            input_1 = int(input("       * Enter first number:  "))
            blank()
            input_2 = int(input("       * Enter second number: "))
            blank()
        if op == ("+"):
            print ("       > "+str(input_1 + input_2))
            blank()
        elif op == ("-"):
            print ("       > "+str(input_1-input_2))
            blank()
        elif op == ("*"):
            print ("       > "+str(input_1*input_2))
            blank()
        elif op == ("/"):
            print ("       > "+str(input_1/input_2))
            blank()
        elif op == ("exp"):
            print ("       > "+str(input_1**input_2))
            blank()
        elif op == ("sqrt"):
            oneInput=int(input("        * Enter number: "))
            blank()
            print ("       > "+str(sqrt(oneInput)))
            blank()

    elif userIn == ("ping"):
        userWebsite=str(input("    * Enter the website: "))
        os.system("ping "+(userWebsite))
        blank()

    elif userIn == ("info"):
        print (" - Current Version: "+currentVersion)
        print (" - Developer: "+developer)
        print (" - "+year)
        blank()

    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)
        blank()
        print ("|---------------------|")
        print ("| Countdown finished! |")
        print ("|---------------------|")
        blank()

    elif ((userIn.endswith(".com") is True) or (userIn.endswith(".org") is True) or ((userIn.endswith(".net") is True)))  and userIn.startswith("www") is False:
        userIn = ("www."+userIn)
        webbrowser.open(userIn)
        blank()

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

#Changelog:
        # -Sourcecode viewer added.
        # -Better indentation with "math" menu.
        # -Better code placement for ease of execution.
        # -Does not fully import "math" module, in fact, now it only imports "sqrt" function.