I was able to reproduce this error by running "python doctests.py" with no arguments. Apparently doctest.master starts out as None and gets initialized when doctest.testmod() is called, so this is a bug in doctests.py. Can you run "python doctests.py *.py" instead with no errors? This bug will have to be fixed, of course, but it shouldn't affect anything else.
--- In firstname.lastname@example.org, "damo_78@..." <damo_78@...> wrote:
> I'm trying to use the aima-python code to use in the online ai-class course from Standford. I'm new to python but have followed the instructions on the wiki fully. I have the latest svn version and the associated data downloaded. The following is the code I'm trying to run, and following that is the error. If anyone can help I would really appreciate it because I'm already falling behind on the course trying to resolve this.
> """Run all doctests from modules on the command line. Use -v for verbose.
> Example usages:
> python doctests.py *.py
> python doctests.py -v *.py
> You can add more module-level tests with
> __doc__ += "..."
> You can add stochastic tests with
> __doc__ += random_tests("...")
> if __name__ == "__main__":
> import sys, glob, doctest
> args = sys.argv[1:]
> modules = [__import__(name.replace('-v *.py',''))
> for arg in args if arg != "-v" for name in glob.glob(arg)]
> for module in modules:
> doctest.testmod(module, report=1)
> print '%d failed out of %d' % doctest.master.summarize()
> The responding error....
> Traceback (most recent call last):
> File "C:\Python27\lib\bdb.py", line 383, in run
> exec cmd in globals, locals
> File "C:\Python27\aima\aima-python\doctests.py", line 12, in <module>
> AttributeError: 'NoneType' object has no attribute 'summarize'