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after finding the right way to install py3 libraries with stash properly, I am still running in this weird import error in the python-pptx library

Traceback (most recent call last):
  File "/private/var/mobile/Containers/Shared/AppGroup/D1B77FF7-7126-4C9B-B6FC-0470A3A25828/File Provider Storage/Repositories/md2pptx/md2pptx.py", line 15, in <module>
    from pptx import Presentation
  File "/private/var/mobile/Containers/Shared/AppGroup/CB775338-75D0-4D40-BCA3-F31D6F8FFE4C/Pythonista3/Documents/site-packages-3/pptx/__init__.py", line 8, in <module>
    import pptx.exc as exceptions
AttributeError: module 'pptx' has no attribute 'exc'

But in fact it has a exc.py in the pptx folder.

Am I missing something?
Help would be appreciated..

Two ways i have seen this problem:
1) make sure you dont have any files called pptx.py, anywhere on your path, or a folder called pptx. That includes your main ~/Documents folder (This iPad), as well as site-packages or site-packages-3. The only one should be the actual installed module.
Also check for any .pyc files, and delete those. sometimes pycs get installed, but those wont work

2) If you started to import, but then hit "X" to cancel, sys.modules gets left in a screwed up state. matplotlib is notorious for this, because the import takes a long time. in that case, simply force quit pythonista, then start fresh.

Ok, that helped a little.
I checked and there are no pptx scripts

Restarting Pythonista changes the error to lxml module (I am still looking for that...)

Traceback (most recent call last):
  File "/var/mobile/Library/Mobile Documents/iCloud~com~omz-software~Pythonista3/Documents/2020-10/test.py", line 1, in <module>
    from pptx import Presentation
  File "/private/var/mobile/Containers/Shared/AppGroup/CB775338-75D0-4D40-BCA3-F31D6F8FFE4C/Pythonista3/Documents/site-packages-3/pptx/__init__.py", line 14, in <module>
    from pptx.api import Presentation  # noqa
  File "/private/var/mobile/Containers/Shared/AppGroup/CB775338-75D0-4D40-BCA3-F31D6F8FFE4C/Pythonista3/Documents/site-packages-3/pptx/api.py", line 15, in <module>
    from .package import Package
  File "/private/var/mobile/Containers/Shared/AppGroup/CB775338-75D0-4D40-BCA3-F31D6F8FFE4C/Pythonista3/Documents/site-packages-3/pptx/package.py", line 11, in <module>
    from .opc.package import OpcPackage
  File "/private/var/mobile/Containers/Shared/AppGroup/CB775338-75D0-4D40-BCA3-F31D6F8FFE4C/Pythonista3/Documents/site-packages-3/pptx/opc/package.py", line 13, in <module>
    from .oxml import CT_Relationships, serialize_part_xml
  File "/private/var/mobile/Containers/Shared/AppGroup/CB775338-75D0-4D40-BCA3-F31D6F8FFE4C/Pythonista3/Documents/site-packages-3/pptx/opc/oxml.py", line 12, in <module>
    from lxml import etree
ImportError: cannot import name 'etree'

After second call it’s the former error again.

Aww, lxml is not supported in pythonista, so you may be out of luck, unless you edit the modules to use regular xml or beautifulsoup instead of lxml.

. Is there a repository or a list about unsupported modules in Pythonista?

So it seems that I have to switch to Pyto for that task. Strange but OK.

@JonB 1000 thanks

i dont think there is an official list of unsupported modules -- anything that relies on c code, that isnt already included in pythonista is unsupported.

A list of modules and their versions included with pythonista can be found here
https://github.com/cclauss/pythonista-module-versions

Anything that is pure py (that doesnt use subprocess, Popen, or a few others), relying on other pure py modules or any of the above generally work.

Pyto has lxml builtin but it is a different app. https://pyto.readthedocs.io/en/latest/