On Fri, Dec 23, 2011 at 11:09:32AM +0700, bino oetomo wrote:
the "print self.writethis" do as told
but the "self.serial.write(self.writethis)" line raise an exceptions ----------START------------- File "./mytac01.tac", line 44, in onMessage self.serial.write(self.writethis) File "/usr/lib/python2.6/dist-packages/twisted/internet/abstract.py", line 191, in write self._tempDataLen += len(data) exceptions.TypeError: object of type 'Element' has no len() --------------------------
It looks like "self.writethis" is an Element, not a string. Python's print statement will automatically call str() on things before it prints them, but Twisted's .write() methods do not. You'll have to change your code to something like this: self.serial.write(str(self.writethis)) Tim.