Pillow 4.1.0 wheels for Windows and Python 3.6 seem to be broken

[Kwpolska]

I’m using Pillow in a project. Our AppVeyor tests started failing today, and it seems that Pillow-4.1.0-cp36-cp36m-win32.whl is broken. This happens with our 3.6 tests only; 2.7 works fine. The most basic import fails with a (vague) DLL error:

Traceback (most recent call last):
  File "C:\projects\nikola\nikola\plugins\task\galleries.py", line 43, in <module>
    from PIL import Image  # NOQA
  File "c:\python36\lib\site-packages\PIL\Image.py", line 56, in <module>
    from . import _imaging as core
ImportError: DLL load failed: The specified procedure could not be found.

[aclark4life]

@Kwpolska Does this help? #2373 (comment)

[Kwpolska]

olefile appears in our install log: https://ci.appveyor.com/project/Kwpolska/nikola/build/1.0.4838/job/fc1fageot4kjv8uq#L125

[wiredfool]

I've tested the install on my win8 vm, and it works for me.

(thinking aloud, we could run tests on appveyor against downloaded files from pypi, skipping the whole build process (in addition to the usual run)).

[hugovk]

Reproducible with Python 3.6 (and not 2.7) on AppVeyor by installing Pillow and trying to import:

from PIL import Image

https://github.com/hugovk/test/blob/2479/test.py

build: false
environment:
  matrix:
    - PYTHON: "C:/Python36"
    - PYTHON: "C:/Python27"
init:
  - "ECHO %PYTHON%"
  - ps: "ls C:/Python*"
install:
  - "%PYTHON%/python.exe -m pip install -U pip setuptools"
  - "%PYTHON%/Scripts/pip.exe install pillow"

test_script:
  - "python.exe test.py"

https://github.com/hugovk/test/blob/2479/appveyor.yml

python.exe test.py
Traceback (most recent call last):
  File "test.py", line 3, in <module>
    from PIL import Image
ImportError: No module named PIL
Command exited with code 1

https://ci.appveyor.com/project/hugovk/test/build/1.0.2

[hugovk]

Also reproducible with Python 3.3, 3.4 and 3.5:
https://ci.appveyor.com/project/hugovk/test/build/1.0.3

[hugovk]

Strangely, also reproducible on Python 3.3, 3.4, 3.5, 3.6 (and not 2.7) with Pillow==4.0.0:
https://ci.appveyor.com/project/hugovk/test/build/1.0.4

[Ismael-VC]

I'm using Pillow (installed with pip) in a Django (1.10.6) project and Python 3.6 (Anaconda) in Windows 10 64 bits, I upgraded my packages, found that Pillow was broken with the message in the first comment, so I had to downgrade to version 4.0.0, for it to work again.

[hugovk]

Also reproducible on Python 3.3, 3.4, 3.5, 3.6 (and not 2.7) with Pillow==3.4.2 (last one before 4.0.0):
https://ci.appveyor.com/project/hugovk/test/build/1.0.8

Similarly with the x64 versions of Python 3 and Pillow 4.1.0. And, for example, C:\Python36-x64\lib\site-packages\PIL contains expected things:
https://ci.appveyor.com/project/hugovk/test/build/1.0.14/job/rnof9qcxqtaah2rb#L1417

But then Nikola's tests fail with Pillow==4.1.0:
https://ci.appveyor.com/project/hugovk/nikola/build/1.0.13
And pass with Pillow==4.0.0:
https://ci.appveyor.com/project/hugovk/nikola/build/1.0.14

So it's odd I can reproduce it with earlier Pillow versions for a simple test version, but more complex Nikola tests pass on 4.0.0 but fail on 4.1.0.

[Kwpolska]

Perhaps it's not (just) Pillow, but also some dependencies that were updated in the meantime?

…

-- Chris Warrick <https://chriswarrick.com/>

On 6 Apr 2017 08:33, "Hugo" ***@***.***> wrote: Also reproducible on Python 3.3, 3.4, 3.5, 3.6 (and not 2.7) with *Pillow==3.4.2* (last one before 4.0.0): https://ci.appveyor.com/project/hugovk/test/build/1.0.8 Similarly with the x64 versions of Python 3 and Pillow 4.1.0. And, for example, C:\Python36-x64\lib\site-packages\PIL contains expected things: https://ci.appveyor.com/project/hugovk/test/build/1.0. 14/job/rnof9qcxqtaah2rb#L1417 But then Nikola's tests fail with Pillow==4.1.0: https://ci.appveyor.com/project/hugovk/nikola/build/1.0.13 And pass with Pillow==4.0.0: https://ci.appveyor.com/project/hugovk/nikola/build/1.0.14 So it's odd I can reproduce it with earlier Pillow versions for a simple test version, but more complex Nikola tests pass on 4.0.0 but fail on 4.1.0. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2479 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAT-m3bNSVo7fpnirGhDGlN9ssUu2ylAks5rtIcmgaJpZM4M0lL7> .

[hugovk]

Pillow's only dependency is Olefile, and the same version is used in the Nikola pass/fail logs. All the installed dependencies are the same versions too.

[wiredfool]

There was an update to zlib to fix #2439.

[cgohlke]

The difference is that Pillow 4.1.0 was built with Python 3.6.1 while Pillow 4.0.0 was built with Python 3.6.0.

Apparently PYTHON36.DLL from Python 3.6.0 is missing functions (PySlice_AdjustIndices and PySlice_Unpack) that are used when building with Python 3.6.1.

The solution is to upgrade to Python 3.6.1.

[cgohlke]

See https://mail.python.org/pipermail/python-dev/2017-March/147707.html and https://bugs.python.org/issue29943

[wiredfool]

On the bright side, not our bug. On the not so bright side.

#include @infinitescream