Usernames An online company needs your help to implement a program that verifies the username chosen by a new user. Their rules is described below: Username MUST contain at least 6 characters; Username cannot start with a number; Username can only contain letters or numbers. If valid, the username may be resgistered if it doesn't already exist in the system. You should not use built-in functions to determine the character type such as isnumeric() or islower(). Use the strings given alphabet and numeric to determine if each character is valid. Use the list registered to help you determine if the username is already registered. Don't forget to execute the cell below to use these strings

EBK JAVA PROGRAMMING
8th Edition
ISBN:9781305480537
Author:FARRELL
Publisher:FARRELL
Chapter2: Using Data
Section: Chapter Questions
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Usernames

An online company needs your help to implement a program that verifies the username chosen by a new user. Their rules is described below:

  1. Username MUST contain at least 6 characters;
  2. Username cannot start with a number;
  3. Username can only contain letters or numbers.

If valid, the username may be resgistered if it doesn't already exist in the system.

  • You should not use built-in functions to determine the character type such as isnumeric() or islower().
    • Use the strings given alphabet and numeric to determine if each character is valid.
  • Use the list registered to help you determine if the username is already registered.

Don't forget to execute the cell below to use these strings

 

# run this cell to create these variables
alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
numeric = "0123456789"
registered = ["john87", "topmage", "light4ever", "username2"]

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