Newbie question: TypeError: 'NoneType' object is not iterable - on exit of pywikibot script - pywikibot

31 May 2024


      Hi all,
on my first steps with Python and Pywikibot, i encounter the following 
strange error message:
2024-05-3116:23:19__init__.py, 373in             _flush: VERBOSE 
  Dropped throttle(s).
2024-05-3116:23:19http.py, 119in              flush: VERBOSE  Closing 
network session.
2024-05-3116:23:19http.py, 123in              flush: VERBOSE  Traceback 
(most recent call last):
   File "<frozen runpy>", line 198, in _run_module_as_main
   File "<frozen runpy>", line 88, in _run_code
   File 
"C:\Users\florian\AppData\Roaming\Python\Python312\Scripts\pwb.exe__main__.py", 
line 7, in <module>
sys.exit(run())
              ^^^^^
   File 
"C:\Users\florian\AppData\Roaming\Python\Python312\site-packages\pywikibot\scripts\wrapper.py", 
line 516, in run
     if not execute():
            ^^^^^^^^^
   File 
"C:\Users\florian\AppData\Roaming\Python\Python312\site-packages\pywikibot\scripts\wrapper.py", 
line 492, in execute
     run_python_file(filename, script_args, module)
   File 
"C:\Users\florian\AppData\Roaming\Python\Python312\site-packages\pywikibot\scripts\wrapper.py", 
line 149, in run_python_file
     exec(compile(source, filename, 'exec', dont_inherit=True),
   File ".\HandleCommonsOnOSMBot.py", line 192, in <module>
     main()
   File ".\HandleCommonsOnOSMBot.py", line 188, in main
HandleCommonsOnOSMBot(generator=gen_factory.getCombinedGenerator(), 
**options).run()
   File 
"C:\Users\florian\AppData\Roaming\Python\Python312\site-packages\pywikibot\bot.py", 
line 1470, in run
self.generator= (item for item in self.generator)
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: 'NoneType'object is not iterable
2024-05-3116:23:19http.py, 132in              flush: CRITICALExiting due 
to uncaught exception TypeError: 'NoneType'object is not iterable
2024-05-3116:23:19http.py, 137in              flush: VERBOSE  Network 
session closed.
This error encounters when my script is finished and pywikibot closing 
the network session. For the complete source code, please see
https://github.com/tohuuuuu/HandleCommonsOnOSMBot/blob/main/HandleCommonsOnO...
I took the part starting with "def main(*args: str) -> None:" from 
https://doc.wikimedia.org/pywikibot/stable/library_usage.html - maybe 
this isn't the correct way to use it? Since the bot code works fine, it 
looks like a minor problem, but i'm curious if i did something wrong.
Cheers
Florian