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xRagnorokx opened this issue Oct 29, 2015 · 4 comments
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Problem with importing matplotlib.animation #5347

xRagnorokx opened this issue Oct 29, 2015 · 4 comments
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OS: Apple

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@xRagnorokx
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Hi all,

I have been having issues with importing matplotlib.animation. In either python or ipython calling the following command hangs forever:

from matplotlib import animation

Import matplotlib, from matplotlib import pyplot etc work fine but obviously do not let me access animation. Upon a cntrl+c I receive the following error messages:

Traceback (most recent call last):
  File "3D-v1.py", line 4, in <module>
    from matplotlib import animation
  File "/Users/---/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 541, in <module>
    class ImageMagickWriter(MovieWriter, ImageMagickBase):
  File "/Users/---/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 66, in wrapper
    if writerClass.isAvailable():
  File "/Users/---/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 267, in isAvailable
    p.communicate()
  File "/Users/---/anaconda/lib/python2.7/subprocess.py", line 799, in communicate
    return self._communicate(input)
  File "/Users/---/anaconda/lib/python2.7/subprocess.py", line 1409, in _communicate
    stdout, stderr = self._communicate_with_poll(input)
  File "/Users/---/anaconda/lib/python2.7/subprocess.py", line 1463, in _communicate_with_poll
    ready = poller.poll()

Build Info:
OS: Mac OS X Lion 10.7.5
Anaconda Version: Original version I had this issue on is unknown but problem persisted on a new install of latest Anaconda python 2.7 and python 3 versions (Anaconda-2.3.0-MacOSX-x86_64.pkg and Anaconda3-2.3.0-MacOSX-x86_64.pkg from https://www.continuum.io/downloads. )

I also reproduced the issue on a separate mac book using a identical new build.

I cannot find any information online about this issue other than a similar problem with importing matplotlib.pyplot. #2919. I tried the steps suggested on the off chance that they would help but they had no effect.

Upon trialing the import on several colleagues Mac books I found that only those running an older version of Anaconda had no issue. Downgrading my machine to Anaconda 2.0.1. (Python 2.7.7 | Anaconda 2.0.1 (x86_64) | (default, Jun 2 2014, 12:48:16) seems to fix the issue.

Apologies if this is the wrong place to post this or if the bug turns out to be in Anaconda or a unique issue with my build / laptop!
@tacaswell
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This looks like it is dying trying to reach out to check if an external command line tool exists.

Your OSX is also pretty old (4years), I wonder if we are running into issues with changes to the OS?

@tacaswell tacaswell added this to the next bug fix release (2.0.1) milestone Oct 29, 2015
@mdboom
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mdboom commented Oct 29, 2015

Can you try putting the following in a Python script and see if it works? It might raise an exception, but it shouldn't hang.

            import subprocess
            p = subprocess.Popen('/bin/bash',
                             shell=False,
                             stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE,
                             creationflags=0)
            p.communicate()

If that fails for you, then it's a problem in Python itself, not matplotlib, and you should report to Anaconda.

@xRagnorokx
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I tested the above suggested code for a few minutes and it too seems to hang on the latest Anaconda versions. I will open a bug report with them and link it to this page.

Thank you for your help!

PS: Yes my OS X is ancient but this close to the end of my thesis I just don't dare to mess with it!

@mdboom
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mdboom commented Oct 30, 2015

You're welcome. I'm closing this just to keep things neat.

@mdboom mdboom closed this as completed Oct 30, 2015
@QuLogic QuLogic removed this from the next bug fix release (2.0.1) milestone Oct 30, 2015
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@mdboom @tacaswell @QuLogic @xRagnorokx