Block hashing algorithm for python3 (https://en.bitcoin.it/wiki/Block_hashing_algorithm)

block_hash.py

import hashlib
from hashlib import sha256
import codecs


def dsha256(data):
    return sha256(sha256(data).digest()).digest()


def ripemd(data):
    return hashlib.new('ripemd160', data).digest()


def main():
    header_hex = (
        "01000000" +
        "81cd02ab7e569e8bcd9317e2fe99f2de44d49ab2b8851ba4a308000000000000" +
        "e320b6c2fffc8d750423db8b1eb942ae710e951ed797f7affc8892b0f1fc122b" +
        "c7f5d74d" + "f2b9441a" + "42a14695"
    )

    header_bin = codecs.decode(header_hex, 'hex')

    hash = dsha256(header_bin)

    print(hash.hex())
    print(hash[::-1].hex())


if __name__ == '__main__':
    main()

# python3 block_hash.py
1dbd981fe6985776b644b173a4d0385ddc1aa2a829688d1e0000000000000000
00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d