I hope that the interested parties who offered me help will remember this thread title. It has been a few weeks.
After fussing around with an alternate installation of Python 2.7.2 on top of Ubuntu Linux 10.04, I decided it would be easier to upgrade to Ubuntu 11.10, for which Python 2.7.2 is the default Python version. I have reproduced my Python 2.6.6 bug in Python 2.7.2, as you will see. On Dec 9, 3:14 pm, I wrote: > All lines of code referenced in the traceback are in the standard > library code: > > Exception in thread Thread-1: > Traceback (most recent call last): > File "/usr/lib/python2.6/threading.py", line 532, in > __bootstrap_inner > self.run() > File "/usr/lib/python2.6/threading.py", line 484, in run > self.__target(*self.__args, **self.__kwargs) > File "/usr/lib/python2.6/multiprocessing/pool.py", line 284, in > _handle_tasks > put(task) > TypeError: expected string or Unicode object, NoneType found > > Fortunately, I have a working version of my code. I was trying to add > new features, and only my new code is causing trouble. This has > allowed me to examine the contexts of task when everything works. > > Task is not a string when the program works. Task is not None when > the program doesn't work. In fact, task is a deeply-nested tuple. NO > PART of this tuple ever contains any strings, as far as I can tell. > More details in my original thread. Here's the traceback that I obtained tonight. It's essentially the same, except for the line numbers in the library code and the thread number which yielded the exception: | Exception in thread Thread-2: | Traceback (most recent call last): | File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner | self.run() | File "/usr/lib/python2.7/threading.py", line 505, in run | self.__target(*self.__args, **self.__kwargs) | File "/usr/lib/python2.7/multiprocessing/pool.py", line 315, in _handle_tasks | put(task) | TypeError: expected string or Unicode object, NoneType found I still have more work to do, I know. I will try to pare down my fairly-complex code to a minimal example. Check back again in a few days? Weeks? Thanks! -- http://mail.python.org/mailman/listinfo/python-list