/matplotlib

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When I run a file that uses matplolib animation, I keep getting this error. Using OS X, Python 2.7, installed Python from python.org then used homebrew. Matplotlib install from pip. #6348

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TariniHardikar opened this Issue Apr 29, 2016 · 4 comments

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  v2.0.0
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@TariniHardikar @tacaswell @QuLogic
@TariniHardikar

TariniHardikar commented Apr 29, 2016 • edited by tacaswell

To help us understand and resolve your issue please check that you have provided
the information below.

  • Matplotlib version, Python version and Platform (Windows, OSX, Linux ...)
  • How did you install Matplotlib and Python (pip, anaconda, from source ...)
  • If possible please supply a Short, Self Contained, Correct, Example
    that demonstrates the issue i.e a small piece of code which reproduces the issue
    and can be run with out any other (or as few as possible) external dependencies.
  • If this is an image generation bug attach a screenshot demonstrating the issue.
  • If this is a regression (Used to work in an earlier version of Matplotlib), please
    note where it used to work.
Error:
Traceback (most recent call last):
  File "HOstates.py", line 20, in <module>
    import matplotlib.animation as animation
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/animation.py", line 365, in <module>
    class FFMpegWriter(MovieWriter, FFMpegBase):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/animation.py", line 49, in wrapper
    if writerClass.isAvailable():
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/animation.py", line 239, in isAvailable
    stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1334, in _execute_child
    child_exception = pickle.loads(data)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1388, in loads
    return Unpickler(file).load()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 864, in load
    dispatch[key](self)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 972, in load_string
    raise ValueError, "insecure string pickle"
ValueError: insecure string pickle

TariniHardikar changed the title from When I run a file that uses matplolib animation, I keep getting this error: to When I run a file that uses matplolib animation, I keep getting this error. Using OS X, Python 2.7, installed Python from python.org then used homebrew. Matplotlib install from pip. Apr 29, 2016

@tacaswell
Owner

tacaswell commented Apr 29, 2016

Also see

#5386
#5314

Can you please provide a minimal example which causes thes error?

tacaswell added the OS/Apple label Apr 29, 2016

@tacaswell
Owner

tacaswell commented Apr 29, 2016

It also looks like this is a python2 only bug, if you can switch to python3
@TariniHardikar

TariniHardikar commented Apr 29, 2016

import numpy as np
import matplotlib ##To get blit working
matplotlib.use('TkAgg') ##
from matplotlib import pyplot as pl
from matplotlib import animation

I'm not sure why, but there is some error with matplotlib animation. Everything else works fine. Is it a version issue?
@QuLogic
Member

QuLogic commented Oct 22, 2016

This is a dupe of the two bugs @tacaswell noted above.

2.0 will require subprocess32 to work around this bug (see #6576.)

QuLogic closed this Oct 22, 2016

QuLogic added this to the 2.0 (style change major release) milestone Oct 22, 2016

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