Implement the function is valid() in password.checker.py that returns True if the given password string meets the following specifications, and False otherwise: At least eight characters long. Contains at least one digit (0-9). Contains at least one uppercase letter. Contains at least one lowercase letter. Contains at least one character that is neither a letter nor a number. $ python password.checker.py Abcdelfg False $ python password.checker.py Abcdel g True import stdio import sys # Returns True if pwd is a valid password and False otherwise def is valid(pwd): # Test client [DO NOT EDIT]. Reads a password string as command-line argument # and writes True if it's valid and False otherwise def main(): pwd = sys.argv[1] stdio.writeln(is valid(pwd)) if name == '_main_': _main()