sha256(py2 vs py3)

前言
sha256 工作量证明，python2 和 python3 的不同

python2

def sha256_pj(prefix):

    chars = ''.join(chr(i) for i in range(32,127)[::-1])
    for password_length in range(4,5):
        for iteration in itertools.product(chars, repeat=password_length):
            iteration = ''.join(iteration)
            h = hashlib.sha256()
            h.update(prefix.encode() + iteration)

            bits = ''.join(bin(int(i, 16))[2:].zfill(4) for i in h.hexdigest())
            print iteration, bits[:18]

            if bits[:18] == "0"*18:
                print "The password is: " + iteration
                return iteration

python3

import hashlib,itertools

def sha256_pj(prefix):

    chars = ''.join(chr(i) for i in range(32,127)[::-1])
    for password_length in range(4,5):
        for iteration in itertools.product(chars, repeat=password_length):
            iteration = ''.join(iteration)
            h = hashlib.sha256()
            h.update((prefix + iteration).encode())

            bits = ''.join(bin(i)[2:].zfill(8) for i in h.digest())
            print(iteration, bits[:18])
            
            if bits[:18] == "0"*18:
                print("The password is: " + iteration)
                return iteration