plt.show() hangs on OSX with Anaconda Python

问题

import matplotlib.pyplot as plt
plt.figure()
plt.show()

...crickets. The interpreter hangs and I can't seem to interrupt it.

This is with Python 2.7.9 and Anaconda 2.2.0 (x86_64) on OSX.

Does this happen for anyone else? How can I solve this problem?

回答1:

Try starting Python using pythonw instead of python.

回答2:

This is most likely an issue with your backend setting. If you want your plots to show up inline (inside of your notebook) import with this added line:

import matplotlib.pyplot as plt
%matplotlib inline

To have your plots show up interactively inline (inside your notebook) import with this line instead:

import matplotlib.pyplot as plt
%matplotlib notebook

To have your plots show up outside of your notebook (in a new window), import with this line instead:

import matplotlib.pyplot as plt
%matplotlib qt

NOTE: You need to restart the kernel to switch between inline notebook and outside qt to avoid the error: Warning: Cannot change to a different GUI toolkit

Finally, if issues persist, the following might help uncover what is going on:

import matplotlib
matplotlib.get_backend()

If using any of the options above, it should output one of the following:

'module://ipykernel.pylab.backend_inline'
'nbAgg'
'Qt4Agg'

回答3:

Modify matplotlib.pyplot import to:

import matplotlib
matplotlib.use('TkAgg') #----> Specify the backend
import matplotlib.pyplot as plt

回答4:

Add this in the beginning of your iPython:

% pylab inline

来源：https://stackoverflow.com/questions/30086663/plt-show-hangs-on-osx-with-anaconda-python

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python

matplotlib

Anaconda