<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _download(self, dstFile):
 """ Download this resource from its URL to the given file object. :type dstFile: io.BytesIO|io.FileIO """

        for attempt in retry(predicate=lambda e: isinstance(e, HTTPError) and e.code == 400):
            with attempt:
                with closing(urlopen(self.url)) as content:
                    buf = content.read()
        contentHash = hashlib.md5(buf)
        assert contentHash.hexdigest() == self.contentHash
        dstFile.write(buf)