Details
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Type:
Bug
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Status: To Do
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Resolution: Unresolved
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Fix Version/s: None
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Component/s: afw, display_matplotlib
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Labels:
Description
Gabriele Comoretto [X] had a problem with a test failure in display_matplotlib. The error he got was:
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../../../../Linux64/afw/14.0-54-g2e4184dee/python/lsst/afw/display/interface.py:692: in setDefaultBackend
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Display.setDefaultBackend(backend)
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backend = 'matplotlib'
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@staticmethod
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def setDefaultBackend(backend):
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try:
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_makeDisplayImpl(None, backend)
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except Exception as e:
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raise RuntimeError(
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> "Unable to set backend to %s: \"%s\"" % (backend, e))
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E RuntimeError: Unable to set backend to matplotlib: "module 'matplotlib' has no attribute 'DisplayImpl'"
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../../../../Linux64/afw/14.0-54-g2e4184dee/python/lsst/afw/display/interface.py:252: RuntimeError
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The problem turned out to be that he did not have libGL.so installed so matplotlib itself could not be imported. I am wondering if the problem is that the backend detection logic in _makeDisplayImpl is trying to do a naive import of backend, and that is working (because matplotlib does exist). The first attempt of lsst.display.matplotlib is failing and matplotlib is next on the list.
I think this line in afw.display is the problem:
if not _disp or not hasattr(_disp.DisplayImpl, "_show"):
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We might want to put a check for DisplayImpl existing as part of the original detection loop. If we do that we still would lose the original ImportError message though.
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