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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def controlMsg(self, requestType, request, buffer, value = 0, index = 0, timeout = 100):
 r"""Perform a control request to the default control pipe on a device. Arguments: requestType: specifies the direction of data flow, the type of request, and the recipient. request: specifies the request. buffer: if the transfer is a write transfer, buffer is a sequence with the transfer data, otherwise, buffer is the number of bytes to read. value: specific information to pass to the device. (default: 0) index: specific information to pass to the device. (default: 0) timeout: operation timeout in milliseconds. (default: 100) Returns the number of bytes written. """

        return self.dev.ctrl_transfer(
                    requestType,
                    request,
                    wValue = value,
                    wIndex = index,
                    data_or_wLength = buffer,
                    timeout = timeout)