ftp download gz file and unzip it in one go

gistfile1.py

import zlib
from ftplib import FTP

def get_gz(ftp, ftp_filename, local_filename):

    decomp = zlib.decompressobj(16+zlib.MAX_WBITS)

    unzip = open (local_filename, 'wb')

    def next_packet(data):
        unzip.write(decomp.decompress(data))

    ftp.retrbinary('RETR ' + ftp_filename, next_packet)

    decompressed = decomp.flush()
    unzip.write(decompressed)
    unzip.close()

ftp_ = FTP('ftp.host.xyz')
ftp_.login()

ftp_.cwd('/foo/bar')

get_gz(ftp_, 'remote-file.gz', 'local-file')