Quickly generate 200 xxxxx-xxxxx-xxxxx-xxxxx activation code format, statistics for each character appears twice

Today saw a very interesting question:

Analysis: The problem there is fast and statistics

1. Generator

2. Statistical dictionary

The following code is able to initiate:

import string
import random

class ITer_:
    def __init__(self):
        self.chars = string.ascii_letters + string.digits

    def __iter__(self):
        for _ in range(200):
            codes =[]
            for _ in range(4):
                codes.append("".join(random.choices(self.chars, k=5)))
                # random.shuffle(codes)
            yield "-".join(codes)

result = "".join([x.stri("-") for x in ITer_()])

# 注意 strip 和repalce
count_tmp = {}
for k in result:
    count_tmp[k] = count_tmp.get(k, 0) + 1

Borrowing a string and random extensions, we are interested can look at their source code, very interesting.