def openStreamWindow(self, streamID, increment):
        """
        Open the stream window by a given increment.

        @param streamID: The ID of the stream whose window needs to be opened.
        @type streamID: L{int}

        @param increment: The amount by which the stream window must be
        incremented.
        @type increment: L{int}
        """
        self.conn.acknowledge_received_data(increment, streamID)
        data = self.conn.data_to_send()
        if data:
            self.transport.write(data)

        Open the stream window by a given increment.

        @param streamID: The ID of the stream whose window needs to be opened.
        @type streamID: L{int}

        @param increment: The amount by which the stream window must be
        incremented.
        @type increment: L{int}
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/_http2.py