incomplete registration

[Low_Ki_]

    for k in existing_usernames.keys():
        if username[0].lower() == k.lower():
            print('Username taken, prompting for new entry.')
            return None
        else:
            print('Username available.')
            return username

Why is that a for loop, if you always return in the first iteration?  Or is it an error that you currently only check the first username?

You're right. I should use the

if any()

just like the above check... Thanks for noticing that!

---

I wrote this... still not working correctly... could I get some help with this block?

if any(k.lower() in existing_usernames.keys() for k in username[0].lower()):
        print('Username taken')
        return None
    else:
        print('Username available')
        return username

---

if any(k in existing_usernames.keys() for k in username):
        print('Username taken')
        return None
    else:
        print('Username available')
        return username

works... but where would I add the .lower() function to check username properly?