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Matplotlib savefig() closes BytesIO object when saving in postscript format#1862

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mdboom merged 1 commit intomatplotlib:masterfrommdboom:ps-file-closing
Mar 27, 2013

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mdboom
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In Python 3, I am seeing the following bug:

In [1]: from io import BytesIOIn [2]: import matplotlib.pyplot as pltIn [3]: b = BytesIO()In [4]: fig = plt.figure()In [5]: ax = fig.add_subplot(1,1,1)In [6]: ax.plot([1,2,3])Out[6]: [<matplotlib.lines.Line2D at 0x104a90990>]In [7]: fig.savefig(b, format='eps')In [8]: b.seek(0)---------------------------------------------------------------------------ValueError                                Traceback (most recent call last)<ipython-input-8-22abda41fe70> in <module>()----> 1 b.seek(0)ValueError: I/O operation on closed file.

As far as I can tell, this does not occur withStringIO in Python 2.x.

@mdboom - is this related to#1779?

@mdboom
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Nope -- this bug is only on master, and perhaps related to#1826.

…handles passed to it on Python 3. The TextIOWrapper that handles the encoding from unicode to ascii needs to be detached before its destructor is called, otherwise it will call close on the underlying file object. Also cleans up how with statements are handled to avoid the sometimes problematic null contextmanager.
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@mdboom - this works for me - thanks!

mdboom added a commit that referenced this pull requestMar 27, 2013
Matplotlib savefig() closes BytesIO object when saving in postscript format
@mdboommdboom merged commitca476df intomatplotlib:masterMar 27, 2013
HubertHolin pushed a commit to HubertHolin/matplotlib that referenced this pull requestApr 7, 2013
…handles passed to it on Python 3. The TextIOWrapper that handles the encoding from unicode to ascii needs to be detached before its destructor is called, otherwise it will call close on the underlying file object. Also cleans up how with statements are handled to avoid the sometimes problematic null contextmanager.
pelson pushed a commit to pelson/matplotlib that referenced this pull requestApr 29, 2013
…handles passed to it on Python 3. The TextIOWrapper that handles the encoding from unicode to ascii needs to be detached before its destructor is called, otherwise it will call close on the underlying file object. Also cleans up how with statements are handled to avoid the sometimes problematic null contextmanager.
@mdboommdboom deleted the ps-file-closing branchAugust 7, 2014 13:50
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