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#! /usr/bin/env python |
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# |
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# Copyright (C) 2015-2016 Rich Lewis <[email protected]> |
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# License: 3-clause BSD |
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""" |
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skchem.utils.suppress |
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Class for suppressing C extensions output. |
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""" |
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import os |
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## |
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# Adapted from: |
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# http://stackoverflow.com/questions/11130156/suppress-stdout-stderr-print-from-python-functions |
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## |
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class Suppressor(object): |
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""" A context manager for doing a "deep suppression" of stdout and stderr. |
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It will suppress all print, even if the print originates in a compiled |
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C/Fortran sub-function. |
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This will not suppress raised exceptions, since exceptions are printed |
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to stderr just before a script exits, and after the context manager has |
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exited (at least, I think that is why it lets exceptions through). |
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""" |
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# always have these on the class, so we can have multiple Suppressors with |
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# out running out of file descriptors |
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null_fds = [os.open(os.devnull, os.O_RDWR) for _ in range(2)] |
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def __init__(self): |
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# Save the actual stdout (1) and stderr (2) file descriptors. |
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self.save_fds = (os.dup(1), os.dup(2)) |
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def __enter__(self): |
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# Assign the null pointers to stdout and stderr. |
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os.dup2(Suppressor.null_fds[0], 1) |
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os.dup2(Suppressor.null_fds[1], 2) |
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def __exit__(self, *_): |
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# Re-assign the real stdout/stderr back to (1) and (2) |
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os.dup2(self.save_fds[0], 1) |
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os.dup2(self.save_fds[1], 2) |
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os.close(self.save_fds[0]) |
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os.close(self.save_fds[1]) |
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richlewis42 /
scikit-chem
