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OSError: [Errno 86] Bad CPU type in executable: 'convert' on import matplotlib.animation #15399

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alinabee opened this issue Oct 10, 2019 · 6 comments
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OSError: [Errno 86] Bad CPU type in executable: 'convert' on import matplotlib.animation #15399

alinabee opened this issue Oct 10, 2019 · 6 comments
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Good first issue Open a pull request against these issues if there are no active ones! topic: animation
Milestone
v3.2.0

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@alinabee
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Bug report

Bug summary

import matplotlib.animation as animation crashes with error on macOS Catalina:

OSError: [Errno 86] Bad CPU type in executable: 'convert'

Code for reproduction

import matplotlib.animation as animation

Actual outcome

(python36) d-i184-9-160:~ alina$ python
Python 3.6.9 |Anaconda, Inc.| (default, Jul 30 2019, 13:42:17) 
[GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib.animation as animation
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/animation.py", line 737, in <module>
    class ImageMagickWriter(ImageMagickBase, MovieWriter):
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/animation.py", line 120, in wrapper
    if writerClass.isAvailable():
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/animation.py", line 730, in isAvailable
    return super().isAvailable()
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/animation.py", line 427, in isAvailable
    return shutil.which(cls.bin_path()) is not None
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/animation.py", line 724, in bin_path
    binpath = mpl._get_executable_info('magick').executable
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/__init__.py", line 384, in _get_executable_info
    return impl([path, "--version"], r"^Version: ImageMagick (\S*)")
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/site-packages/matplotlib/__init__.py", line 324, in impl
    args, stderr=subprocess.STDOUT, universal_newlines=True)
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/subprocess.py", line 423, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/Users/alina/anaconda3/envs/python36/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 86] Bad CPU type in executable: 'convert'

Expected outcome
Expect to load library with no error.

Matplotlib version

  • Operating system: Latest Mac version (likely the culprit) -- MacOS Catalina V10.15
  • Matplotlib version: 3.1.1
  • Matplotlib backend (print(matplotlib.get_backend())): MacOSX
  • Python version: Python 3.7.3 & Python 3.6.9 :: Anaconda, Inc.
  • Jupyter version (if applicable): N/A
  • Other libraries:

Matplotlib was installed using conda default channel
@ImportanceOfBeingErnest
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Concerning the concrete issue here, I have no idea if this is due to a broken ImageMagick install, another application shadowing convert (as we have in windows) or a specific issue with MacOS Catalina.

However, in general this points to a problem with finding the available writers: I suppose we would want to catch OSError in

matplotlib/lib/matplotlib/__init__.py

Line 340 in 74ed294

except FileNotFoundError as _fnf:

as well? As for availability it's not really important if the file is not there, or cannot be run, right?

More logging info from

matplotlib/lib/matplotlib/animation.py

Lines 726 to 728 in 74ed294

except mpl.ExecutableNotFoundError:
# May be raised by get_executable_info.
return False
wouldn't hurt either?!

That is, I would say whatever strange things might happen trying to find available movie writers, the module should load just fine and spill out any strange encounters into the log.

@ImportanceOfBeingErnest ImportanceOfBeingErnest added this to the v3.3.0 milestone Oct 10, 2019
@alinabee
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Thanks for the assistance. Turns out my "convert" executable was not working:

Alinas-MacBook-Pro:~ alina$ convert
-bash: /usr/local/bin/convert: Bad CPU type in executable

I reinstalled ImageMagick through homebrew, but that didn't fix the "convert" executable.

The solution was to simply remove the file "convert" from /usr/local/bin, and now matplotlib works fine.

@anntzer
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anntzer commented Oct 10, 2019

As mentioned by @ImportanceOfBeingErnest we should catch OSError, not FNFError here.

@anntzer anntzer reopened this Oct 10, 2019
@anntzer anntzer added the Good first issue Open a pull request against these issues if there are no active ones! label Oct 10, 2019
@dopplershift
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For future googlers, the problem with convert here is that macOS Catalina dropped support for 32-bit executables.

@immaxchen
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Hi @anntzer , can I take this issue? I'm new to open source. 😁

@jklymak
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jklymak commented Oct 12, 2019

@immaxchen New contributors always welcome. Please check out the developer's guide in the docs.

tacaswell added a commit that referenced this issue Oct 13, 2019
@tacaswell
Merge pull request #15413 from immaxchen/catch-os-err-instead-of-fnf-…
19d589c 
…err-issue-15399

FIX: catch OSError instead of FileNotFoundError in _get_executable_info 

closes #15399
meeseeksmachine pushed a commit to meeseeksmachine/matplotlib that referenced this issue Oct 13, 2019
@tacaswell
Backport PR matplotlib#15413: catch OSError instead of FileNotFoundEr…
2cd491f 
…ror in _get_executable_info to resolve matplotlib#15399
@meeseeksmachine meeseeksmachine mentioned this issue Oct 13, 2019
Merged
tacaswell added a commit that referenced this issue Oct 13, 2019
@tacaswell
Merge pull request #15414 from meeseeksmachine/auto-backport-of-pr-15…
2da3832 
…413-on-v3.2.x

Backport PR #15413 on branch v3.2.x (catch OSError instead of FileNotFoundError in _get_executable_info to resolve #15399)
@QuLogic QuLogic modified the milestones: v3.3.0, v3.2.0 Oct 15, 2019
Closed
@mlondschien mlondschien mentioned this issue Nov 3, 2022
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Good first issue Open a pull request against these issues if there are no active ones! topic: animation
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@dopplershift @QuLogic @anntzer @jklymak @alinabee @ImportanceOfBeingErnest @immaxchen