CODEWITHSUNDEEP
python
Versace
Versace

Reputation: 185

How do I add a retry option to a function in Python?

Pretty new to Python, trying to create a simple login system here (has to be done this way). I've already defined a user() function which asks for the username and checks its validity. This function starts by calling the user function. Here is the main part:

user() 

    if user in userlist:
        while True:
            pass = raw_input("Enter password, or X to retry: ")
            if pass == 'X':
                break
            if userlist[user] == pass:
                break
            else:
                print "Invalid password."

I want the function to loop back to asking for username input if X is entered. The rest of it works fine but as it stands, entering X just ends the function and doesn't loop it back to the start. Is this just not possible or can I rewrite it to work? I assume I'd need to include user() into the loop but I've encountered various errors while trying.

Upvotes: 0

Views: 390

Answers (3)

D Sharif
D Sharif

Reputation: 1

You'll have to do:

if password == 'X':
    continue #restarts loop at while

Upvotes: 0

kindall
kindall

Reputation: 184211

You intentionally say to exit the loop if the user enters X by using the break statement. That's why the loop is exiting. Instead of break use continue.

if password == 'X':
    continue

This will start the loop over again at the top.

As another user notes, you can't use pass as a variable name. The code you posted clearly isn't the code you're actually running. Anyway, I've assumed that you really used the name password.

Upvotes: 5

Tommy
Tommy

Reputation: 620

Don't use pass as a variable name because it clobbers the builtin pass. What you want is

if passwd == 'X':
    continue #restart at top of loop

Upvotes: 0

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