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cournape opened this issue Jan 26, 2017 · 7 comments
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Cannot import _tkagg on windows 64 bits on 2.7 #7953

cournape opened this issue Jan 26, 2017 · 7 comments
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GUI: tk OS: Microsoft

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@cournape
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cournape commented Jan 26, 2017 •
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It looks like the tk backend is broken with 1.5.3 and 2.0.0 on windows, most likely following #6442

To reproduce:

  1. install python 2.7.12 x64 windows from python.org, and wheels gholke for 2.7
  2. do python -c "import matplotlib.backends._tkagg", which fails:
>>> import matplotlib.backends._tkagg
...
RuntimeError: Could not find TCL routines

I have seen the same issue with:

  • our own build of 1.5.3 in canopy (for 2.7)
  • in Gholke wheels for 1.5.3 and 2.0.0 (2.7.12)
  • conda package as well for 1.5.3 (both 2.7.13 and 3.5.2)
@tacaswell tacaswell added this to the 2.0.1 (next bug fix release) milestone Jan 26, 2017
@tacaswell tacaswell added Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. OS: Microsoft GUI: tk labels Jan 26, 2017
@tacaswell
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How does it fail (I do not have easy access to a win64 box to test on)?

Does this also affect py3?

attn @matthew-brett @cgohlke (sorry)

@cournape
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Oups, forgot that piece of info when rewriting my bug report from #6442. I am also testing on py3 now

@cournape
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I updated my findings on python 3 (same result)

@cgohlke
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cgohlke commented Jan 26, 2017

I don't think import matplotlib.backends._tkagg can work without first loading the Tk DLLs into the process, e.g. by import _tkinter first. In practice I have never run into this error because the usual way to import the backend is import matplotlib.backends.backend_tkagg. Maybe I am missing something?

@cournape
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Ah, that makes sense. I will see if that works in embedded modes as well.

@tacaswell
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@cournape Any update on this?

@tacaswell
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Reported fixed in a private email.

@QuLogic QuLogic removed this from the 2.0.1 (next bug fix release) milestone Mar 13, 2017
@QuLogic QuLogic removed the Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. label Mar 13, 2017
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