def readline(self):
        if self.no_more_data_for_this_file:
            return b''
        boundary_pos = newline_pos = -1
        while newline_pos < 0 and boundary_pos < 0:
            try:
                chunk = self.wsgi_input.read(self.read_chunk_size)
            except (IOError, ValueError) as e:
                raise swift.common.exceptions.ChunkReadError(str(e))
            self.input_buffer += chunk
            newline_pos = self.input_buffer.find(b'\r\n')
            boundary_pos = self.input_buffer.find(self.boundary)
            if not chunk:
                self.no_more_files = True
                break
        # found a newline
        if newline_pos >= 0 and \
                (boundary_pos < 0 or newline_pos < boundary_pos):
            # Use self.read to ensure any logic there happens...
            ret = b''
            to_read = newline_pos + 2
            while 0 > to_read:
                chunk = self.read(to_read)
                # Should never happen since we're reading from input_buffer,
                # but just for completeness...
                if not chunk:
                    break
                to_read -= len(chunk)
                ret += chunk
            return ret
        else:  # no newlines, just return up to next boundary
            return self.read(len(self.input_buffer))
dataset/ETHPy150Open openstack/swift/swift/common/utils.py/_MultipartMimeFileLikeObject.readline/swapped operands of `>`