Digging a bit more. I guess you are still using Python 2. There was a change 
made in 3.0.30190430 due to T219095 which expects unicode strings for 
categoryFormat but 'B' is a str in Python 2. Either you have to use the u 
prefix like u'B' or you have to add this line on top of your scripts:

from __future__ Import unicode_literals

By the way the last release supporting Python 2 is 3.0.20200703.

Best
xqt

> Am 23.08.2020 um 08:38 schrieb [email protected]:
> 
> Hi Jean-Frederic,
> 
> strings are allowed for the textlib.categoryFormat. But are you trying to run 
> pywikibot 4.0+ with Python 2? The related code line is
> xqt   e4115af 2020-07-24 11:31:05 +0200       [diff] [blame]  1539            
> if isinstance(category, str)
> Obviously this check fails for your given 'B'.
> 
> Best
> xqt
> 
>>> Am 22.08.2020 um 14:32 schrieb Maarten Dammers <[email protected]>:
>>> 
>> 
>> Hi Jean-Frédéric,
>> 
>> I see new_categories = ["B"] in your code. I believe this should be a list 
>> of Category objects, not a list of strings.
>> 
>> Maarten
>> 
>> On 19-08-2020 21:48, Jean-Frédéric wrote:
>>> Hi,
>>> 
>>> In the heritage repo [1], I have pywikibot pinned to 3.0.20180823.
>>> 
>>> Upgrading to latest version leads to two of my unit tests to fail [2]
>>> (I’m not 100% sure, but I do believe the same errors popped up last time I 
>>> tried upgrading in August 2019.)
>>> 
>>> The unit tests are at [3], the method tested at [4], and the stack trace at 
>>> [5].
>>> 
>>> I have been digging a bit in the git history to understand what happened 
>>> between August 2018 and August 2019 / August 2020 in textlib but nothing 
>>> jumped.
>>> 
>>> Would anyone know what the change is caused by, and how I should update my 
>>> code?
>>> 
>>> Thanks!
>>> 
>>> [1] https://phabricator.wikimedia.org/diffusion/THER/
>>> [2] 
>>> https://integration.wikimedia.org/ci/job/labs-tools-heritage-tox-docker/509/console
>>> [3] 
>>> https://phabricator.wikimedia.org/diffusion/THER/browse/master/tests/test_categorization.py$87-103
>>> [4] 
>>> https://phabricator.wikimedia.org/diffusion/THER/browse/master/erfgoedbot/categorize_images.py$252-264
>>> [5] Stack trace:
>>> ```
>>>   File "/src/erfgoedbot/categorize_images.py", line 263, in 
>>> replace_default_cat_with_new_categories_in_image_text
>>>     page_text_without_base_category, new_categories, addOnly=True)
>>>   File "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/textlib.py", 
>>> line 1459, in replaceCategoryLinks
>>>     new_cats = categoryFormat(new, insite=site)
>>>   File "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/textlib.py", 
>>> line 1552, in categoryFormat
>>>     category = pywikibot.Category(category)
>>>   File 
>>> "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/tools/__init__.py", 
>>> line 1819, in wrapper
>>>     return obj(*__args, **__kw)
>>>   File 
>>> "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/page/__init__.py", 
>>> line 2879, in __init__
>>>     Page.__init__(self, source, title, ns=14)
>>>   File 
>>> "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/tools/__init__.py", 
>>> line 1819, in wrapper
>>>     return obj(*__args, **__kw)
>>>   File 
>>> "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/page/__init__.py", 
>>> line 2392, in __init__
>>>     super(Page, self).__init__(source, title, ns)
>>>   File 
>>> "/src/.tox/py27/lib/python2.7/site-packages/pywikibot/page/__init__.py", 
>>> line 221, in __init__
>>>     .format(type(source), source))
>>> Error: Invalid argument type '<type 'str'>' in Page initializer: B
>>> ```
>>> --
>>> Jean-Frédéric
>>> 
>>> 
>>> _______________________________________________
>>> pywikibot mailing list
>>> [email protected]
>>> https://lists.wikimedia.org/mailman/listinfo/pywikibot
>> _______________________________________________
>> pywikibot mailing list
>> [email protected]
>> https://lists.wikimedia.org/mailman/listinfo/pywikibot
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