incomplete registration

[Low_Ki_]

Fixed some repetitive stuff... IE:

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

to:

def check_new_old(username, existing_usernames):
    invalid_chars = '~ ` ! @ # $ % ^ & * ( ) + = { [ } ] : ; " \' < , > . ? / | \ '.split()
    if any(x in invalid_chars for x in list(username[0])) or (' ' in list(username[0])) or (len(username[0]) > 12):
        print('Username can\'t contain invalid characters and no longer than 12 characters: \n'
        + str(invalid_chars))
        return None
    else:
        print('Need to fix check')
        pass
    
    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