Python: AttributeError: module 'PIL' has no attribute 'PngImagePlugin'

[CarloLucibello]

Hi,
I have a problem with my package where I import the pillow module as the PIL variable in the package's init
https://github.com/CarloLucibello/HuggingFaceDatasets.jl/blob/3362f5650483e6ace17e7f2d98af36252d9f4316/src/HuggingFaceDatasets.jl#L43

I run the package's tests

include("test/runtests.jl")

and I get the error

Python: AttributeError: module 'PIL' has no attribute 'PngImagePlugin'
  Python stacktrace: none
  Stacktrace:
    [1] pythrow()
      @ PythonCall ~/.julia/packages/PythonCall/dsECZ/src/err.jl:94
    [2] errcheck
      @ ~/.julia/packages/PythonCall/dsECZ/src/err.jl:10 [inlined]
    [3] pygetattr(x::Py, k::String)
      @ PythonCall ~/.julia/packages/PythonCall/dsECZ/src/abstract/object.jl:60
    [4] getproperty
      @ ~/.julia/packages/PythonCall/dsECZ/src/Py.jl:272 [inlined]
    [5] _pyconvert(x::Py)
      @ HuggingFaceDatasets ~/juliadev/HuggingFaceDatasets/src/transforms.jl:8
    [6] py2jl(x::Py)
      @ HuggingFaceDatasets ~/juliadev/HuggingFaceDatasets/src/transforms.jl:33

The weird thing is that the module actually exists

julia> HuggingFaceDatasets.PIL.PngImagePlugin
Python module: <module 'PIL.PngImagePlugin' from '/home/lucibello/juliadev/HuggingFaceDatasets/.CondaPkg/env/lib/python3.11/site-packages/PIL/PngImagePlugin.py'>

and that when I rum some of the tests individually the error disappears and after that also include("test/runtests.jl") works fine.
Any clue?

[cjdoris]

Presumably the code is trying to access PIL.PngImagePlugin before it has been imported. This sounds like a bug in your tests.

It probably works after running some other tests because they probably do import that module, so it is available again later through attribute access.

[CarloLucibello]

having

PythonCall.pycopy!(PIL, pyimport("PIL"))
pyimport("PIL.PngImagePlugin")

in the package __init__ solves the issue for me.