keyGen.py

import random

class Key:
    def __init__(self,key=''):
        if(key==''):
            self.key=self.generate()
        else:
            self.key=key.lower()

    def generate(self):
        key = ''
        chunk=''
        alphabets = 'abcdefghijklmnopqrstuvwxyz1234567890'
        while True:
            while len(key) < 25 :
                char = random.choice(alphabets)
                key += char
                chunk+=char
                if len(chunk) == 4:
                    key+='-'
                    chunk=''
            key = key[:-1]
            if Key(key).verify():
                return key
            else:
                key=''

    def verify(self):
        score=0
        check_digit=self.key[0]
        check_digit_count=0
        chunks =    self.key.split('-')
        for chunk in chunks:
            if len(chunk)!=4:
                return False
            for char in chunk:
                if(char == check_digit):
                    check_digit_count +=1
                score += ord(char)
        if score > 1770 and check_digit_count == score%6:
            return True
        return False

    def __str__(self):
        valid = 'Invalid'
        if self.verify():
            valid = 'Valid'
            
        return self.key.upper()+' '+valid

key=Key()
print(key)