python-ftplib-callback.py

from ftplib import FTP
from hashlib import md5, sha1

ftp = FTP('ftp.acc.umu.se')
ftp.login()

ftp.cwd('mirror/wikimedia.org/dumps/enwiki/20201020/')
filename = 'enwiki-20201020-langlinks.sql.gz'

md5data = md5()
sha1data = sha1()

ftp.retrbinary(f'RETR {filename}', lambda data: (
    md5data.update(data),
    sha1data.update(data)
))

ftp.quit()

assert md5data.digest() == bytes.fromhex('ad1eca2f492665d5757ce8a3b8e6c70f')
assert sha1data.digest() == bytes.fromhex('9a0ad7d077d4fddf64f82479f7537429355c1ee0')