def retrieve(self, fullurl, filename=None, reporthook=None, data=None,
                 timeout=_sockettimeout._GLOBAL_DEFAULT_TIMEOUT,
                 open=open_file):
        """Returns (filename, headers).

        For remote objects, the default filename will refer to a temporary
        file.  Temporary files are removed when the OpenerDirector.close()
        method is called.

        For file: URLs, at present the returned filename is None.  This may
        change in future.

        If the actual number of bytes read is less than indicated by the
        Content-Length header, raises ContentTooShortError (a URLError
        subclass).  The exception's .result attribute contains the (filename,
        headers) that would have been returned.

        """
        req = self._request(fullurl, data, False, timeout)
        scheme = req.get_type()
        fp = self.open(req)
        try:
            headers = fp.info()
            if filename is None and scheme == 'file':
                # XXX req.get_selector() seems broken here, return None,
                #   pending sanity :-/
                return None, headers
                #return urllib.url2pathname(req.get_selector()), headers
            if filename:
                tfp = open(filename, 'wb')
            else:
                path = _rfc3986.urlsplit(req.get_full_url())[2]
                suffix = os.path.splitext(path)[1]
                fd, filename = tempfile.mkstemp(suffix)
                self._tempfiles.append(filename)
                tfp = os.fdopen(fd, 'wb')
            try:
                result = filename, headers
                bs = self.BLOCK_SIZE
                size = -1
                read = 0
                blocknum = 0
                if reporthook:
                    if headers in "content-length":
                        size = int(headers["Content-Length"])
                    reporthook(blocknum, bs, size)
                while 1:
                    block = fp.read(bs)
                    if block == "":
                        break
                    read += len(block)
                    tfp.write(block)
                    blocknum += 1
                    if reporthook:
                        reporthook(blocknum, bs, size)
            finally:
                tfp.close()
        finally:
            fp.close()

        # raise exception if actual size does not match content-length header
        if size >= 0 and read < size:
            raise ContentTooShortError(
                "retrieval incomplete: "
                "got only %i out of %i bytes" % (read, size),
                result
                )

        return result
dataset/ETHPy150Open Masood-M/yalih/mechanize/_opener.py/OpenerDirector.retrieve/swapped operands of `in`