I'm making my first Python program using Python 3 but for some reason it gives me an error -

i wanted test program in middle of writing it, won't start reason

code:

def main():     menu() def menu():     print("1.login\n2.register\n\n1.help")     input = int(input("enter corresponding number action executed: "))     if input==3:         help()     if input==2:         register()     if input==1:         login()  def help():     print("\nif enter number 1 (1) prompted login system\nif enter number 2 (2) prompted register, can login")  def register():     usernamer = input("enter username: ")     open("usernamesr.txt","wt") output:         output.write(usernamer)     print("your username is: "+usernamer)     passwordr = str(input("\nenter password: "))     open("passwordsr.txt","wt") output:         output.write(passwordr)     print("your password is: "+passwordr)  def login():     print("")  if __name__=="__main__":     main() 

this error got:

1.login

traceback (most recent call last):

2.register

file "c:/users/joseph/pycharmprojects/learningpython/login_system.py", line 30, in main()

1.help

file "c:/users/joseph/pycharmprojects/learningpython/login_system.py", line 2, in main

menu()

file "c:/users/joseph/pycharmprojects/learningpython/login_system.py", line 5, in menu input = int(input("enter corresponding number action executed: "))

unboundlocalerror: local variable 'input' referenced before assignment

input() ins in build function,

in code give variable name input, give different variable name.

def menu():     print("1.login\n2.register\n\n1.help")     input = int(input("enter corresponding number action executed: "))     # ^^^^