/usr/lib/python2.7/dist-packages/pyfits/

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/usr/lib/python2.7/dist-packages/pyfits/_compat/weakref.py is in python-pyfits 1:3.4-4ubuntu1.

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"""Support WeakSet on Python 2.6"""

try:
    from weakref import WeakSet
except ImportError:
    from ._weakset_py2 import WeakSet

python-pyfits 1:3.4-4ubuntu1 / usr / lib / python2.7 / dist-packages / pyfits / _compat / weakref.py