login screen

userinformation={} # creates an empty dictionary
check= int(input("Do you alrady have an account? 0 if yes and 1 if no: ")) #user chooses if he has an account already
if check== 0: # if user says yes then he can login
 username=input("Type in Your username: ")  # User types in a username
 password= input("Type in Your password: ") # user types in a password
 if username or password in userinformation:  #checks if the username is already in the dictionary
     print("Username or password already taken please choose another one") #if so then:
 else:
     userinformation[username]=password
     print(userinformation) #else the programm will safe the user inputs and print them out
elif check==1:
     print("please  register: ") # if user says  "no" then he must register
     username=input("Type in a username: ")
     password=input("Type in a passwsord: ")
     userinformation[username]=password #username and password will be saved
     print (userinformation) #and printed
elif check==2:
     print(userinformation) # secret input to print all user who have registered