Found when looking at T209094: weblinkchecker.py: TypeError: 'unicode' object is not callable (where in that one only API warning for this subject was raised)
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$ ./pwb.py weblinkchecker -start:! -lang:en Retrieving 240 pages from wikipedia:en. WARNING: API error too-many-titles: Too many values supplied for parameter "titles". The limit is 50. 0 pages read 0 pages written Execution time: 2 seconds Script terminated by exception: ERROR: APIError: too-many-titles: Too many values supplied for parameter "titles". The limit is 50. [help:See https://en.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes.] Saving history... Traceback (most recent call last): File "./pwb.py", line 257, in <module> if not main(): File "./pwb.py", line 250, in main run_python_file(filename, [filename] + args, argvu, file_package) File "./pwb.py", line 119, in run_python_file main_mod.__dict__) File "./scripts/weblinkchecker.py", line 1055, in <module> main() File "./scripts/weblinkchecker.py", line 1017, in main bot.run() File "pywikibot/bot.py", line 1477, in run for item in self.generator: File "pywikibot/pagegenerators.py", line 1747, in RedirectFilterPageGenerator for page in generator or []: File "pywikibot/pagegenerators.py", line 2192, in PreloadingGenerator for i in site.preloadpages(group, groupsize): File "pywikibot/site.py", line 3406, in preloadpages for pagedata in rvgen: File "pywikibot/data/api.py", line 3148, in __iter__ for result in super(PropertyGenerator, self).__iter__(): File "pywikibot/data/api.py", line 2972, in __iter__ self.data = self.request.submit() File "pywikibot/data/api.py", line 2273, in submit raise APIError(**result['error']) pywikibot.data.api.APIError: too-many-titles: Too many values supplied for parameter "titles". The limit is 50. [help:See https://en.wikipedia.org/w/api.php for API usage. Subscribe to the mediawiki-api-announce mailing list at <https://lists.wikimedia.org/mailman/listinfo/mediawiki-api-announce> for notice of API deprecations and breaking changes.] <class 'pywikibot.data.api.APIError'> CRITICAL: Closing network session.
Last git version, Python 2.7.15rc1