[Libreoffice-bugs] [Bug 133123] New: Pyhon module uno.py overrides import, resulting in failure of subsequent import cairosvg module

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=133123

            Bug ID: 133123
           Summary: Pyhon module uno.py overrides import, resulting in
                    failure of subsequent import cairosvg module
           Product: LibreOffice
           Version: 6.4.3.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: sdk
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: spljaa at gmail.com

Description:
Python module uno.py overrides import. And that overwritten function fails to
import some modules. Cairosvg is one example.
Workaround is to import carirosvg before libreoffice ones.
It looks like sys.modules can contain entry for module with value None. Maybe
simple check against that would work. Or maybe there is needed other approach
with Python 3.8?

Steps to Reproduce:
Simle code like:
import uno
import cairosvg

After failure it looks like sys.modules["_elementtree"] is None.
(Key exists in that dict, but with None as value)

Actual Results:
Traceback (most recent call last):
  File "test.py", line 2, in <module>
    import cairosvg
  File "/usr/lib64/python3.8/site-packages/uno.py", line 359, in _uno_import
    return _builtin_import(name, *optargs, **kwargs)
  File "/usr/lib/python3.8/site-packages/cairosvg/__init__.py", line 42, in
<module>
    from . import surface  # noqa isort:skip
  File "/usr/lib64/python3.8/site-packages/uno.py", line 359, in _uno_import
    return _builtin_import(name, *optargs, **kwargs)
  File "/usr/lib/python3.8/site-packages/cairosvg/surface.py", line 28, in
<module>
    from .defs import (
  File "/usr/lib64/python3.8/site-packages/uno.py", line 359, in _uno_import
    return _builtin_import(name, *optargs, **kwargs)
  File "/usr/lib/python3.8/site-packages/cairosvg/defs.py", line 24, in
<module>
    from .bounding_box import calculate_bounding_box, is_non_empty_bounding_box
  File "/usr/lib64/python3.8/site-packages/uno.py", line 359, in _uno_import
    return _builtin_import(name, *optargs, **kwargs)
  File "/usr/lib/python3.8/site-packages/cairosvg/bounding_box.py", line 28, in
<module>
    from .parser import Tree
  File "/usr/lib64/python3.8/site-packages/uno.py", line 359, in _uno_import
    return _builtin_import(name, *optargs, **kwargs)
  File "/usr/lib/python3.8/site-packages/cairosvg/parser.py", line 28, in
<module>
    from defusedxml import ElementTree
  File "/usr/lib64/python3.8/site-packages/uno.py", line 359, in _uno_import
    return _builtin_import(name, *optargs, **kwargs)
  File "/usr/lib/python3.8/site-packages/defusedxml/ElementTree.py", line 63,
in <module>
    _XMLParser, _iterparse, ParseError = _get_py3_cls()
  File "/usr/lib/python3.8/site-packages/defusedxml/ElementTree.py", line 48,
in _get_py3_cls
    pure_pymod = importlib.import_module(pymodname)
  File "/usr/lib64/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "/usr/lib64/python3.8/xml/etree/ElementTree.py", line 2053, in <module>
    from _elementtree import *
  File "/usr/lib64/python3.8/site-packages/uno.py", line 383, in _uno_import
    d = mod.__dict__
AttributeError: 'NoneType' object has no attribute '__dict__'


Expected Results:
Proper import of cairosvg, with modules it imports. 
Workaround is to use:
import cairosvg
import uno


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Python 3.8.2
libreoffice-pyuno-6.4.3.2-1.fc32.x86_64

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