Ukrywanie wpisu hasła raw_input ()

Chcę ukryć moje hasło, ale nie wiem jak. widziałemshow="*" i równieżgetpass ale nie wiem, jak je umieścić w tym kodzie. Używam Pythona 2.7.3 i koduję na Raspberry Pi.

ans = True

while ans:
    print("""
                   -------------
                  | 1. Shutdown | 
                  | 2. Items    |
                   -------------
    """)

    ans=raw_input("""

             Please Enter A Number: """)

    if ans == "1":

        exit()
    elif ans == "2":


        pa=raw_input("""

             Please Enter Password: """)

        if pa == "zombiekiller":

            print("""
                   ----------------
                  | 1. Pi password |
                  | 2. Shutdown    |
                   ----------------
            """)

            pe=raw_input ("""

             Please Enter A Number: """)

            if pe == "1":
                print ("""

             Pi's Password Is Adminofpi""")
                import time
                time.sleep(1)
                exit()

            elif pe == "2":
                exit()

            else:
                print("""

             You Have Entered An Inccoredt Option. Terminating Programm""")
                import time
                time.sleep(1)
                exit()

        else:
                print("""

             You Have Entered An Inccorect Password. Terminating Programm""")
                import time
                time.sleep(1)
                exit()

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