python - Download a gzipped file, md5 checksum it, and then save extracted data if matches -

i'm attempting download 2 files using python, 1 gzipped file, , other, checksum.

i verify gzipped file's contents match md5 checksum, , save contents target directory.

i found out how download files here, , learned how calculate checksum here. load urls json config file, , learned how parse json file values here.

i put following script, i'm stuck attempting store verified contents of gzipped file.

import json import gzip import urllib import hashlib  # function creating md5 checksum of file def md5gzip(fname):     hash_md5 = hashlib.md5()      gzip.open(fname, 'rb') f:         # make iterable of file , divide 4096 byte chunks         # iteration ends when hit empty byte string (b"")         chunk in iter(lambda: f.read(4096), b""):             # update md5 hash chunk             hash_md5.update(chunk)      return hash_md5.hexdigest()  # open configuration file in current directory open('./config.json') configfile:     data = json.load(configfile)  # open downloaded checksum file open(urllib.urlretrieve(data['checksumurl'])[0]) checksumfile:     md5checksum = checksumfile.read()  # open downloaded db file , it's md5 checksum via gzip.open filemd5 = md5gzip(urllib.urlretrieve(data['fileurl'])[0])  if (filemd5 == md5checksum):     print 'downloaded correct file'     # save correct file else:     print 'downloaded incorrect file'     # error handling 

in md5gzip, return tuple instead of hash.

def md5gzip(fname):     hash_md5 = hashlib.md5()     file_content = none      gzip.open(fname, 'rb') f:         # make iterable of file , divide 4096 byte chunks         # iteration ends when hit empty byte string (b"")         chunk in iter(lambda: f.read(4096), b""):             # update md5 hash chunk             hash_md5.update(chunk)         # file content         f.seek(0)         file_content = f.read()      return hash_md5.hexdigest(), file_content 

then, in code:

filemd5, file_content = md5gzip(urllib.urlretrieve(data['fileurl'])[0])