43 lines
1.5 KiB
Python
43 lines
1.5 KiB
Python
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"""
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A replacement wrapper around the subprocess module, which provides a stub
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implementation of subprocess members on Google App Engine
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(which are missing in subprocess).
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Instead of importing subprocess, other modules should use this as follows:
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from matplotlib.compat import subprocess
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This module is safe to import from anywhere within matplotlib.
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"""
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import subprocess
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from matplotlib.cbook import warn_deprecated
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warn_deprecated(since='3.0',
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name='matplotlib.compat.subprocess',
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alternative='the python 3 standard library '
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'"subprocess" module',
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obj_type='module')
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__all__ = ['Popen', 'PIPE', 'STDOUT', 'check_output', 'CalledProcessError']
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if hasattr(subprocess, 'Popen'):
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Popen = subprocess.Popen
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# Assume that it also has the other constants.
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PIPE = subprocess.PIPE
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STDOUT = subprocess.STDOUT
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CalledProcessError = subprocess.CalledProcessError
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check_output = subprocess.check_output
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else:
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# In restricted environments (such as Google App Engine), these are
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# non-existent. Replace them with dummy versions that always raise OSError.
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def Popen(*args, **kwargs):
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raise OSError("subprocess.Popen is not supported")
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def check_output(*args, **kwargs):
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raise OSError("subprocess.check_output is not supported")
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PIPE = -1
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STDOUT = -2
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# There is no need to catch CalledProcessError. These stubs cannot raise
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# it. None in an except clause will simply not match any exceptions.
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CalledProcessError = None
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