Here's how to install SnapPy on the VMWare version of SAGE; you have
to do a little hack to account for the fact that certain header files
are missing.

wget -nd http://www.math.uic.edu/~t3m/SnapPy/SnapPy.tar.gz
tar xfz SnapPy.tar.gz; cd SnapPy
sudo sage -python -m easy_install -U cython
sudo sage -python -m easy_install -U sphinx
# Edit line 207 of "setup.py" to read:  "ext_modules = [SnapPyC],"
sudo sage -python setup.py install
sudo sage -python setup.py build_docs install
cd ../; sage  # test
----------------------------------------------------------------------
| Sage Version 4.0, Release Date: 2009-05-29                         |
| Type notebook() for the GUI, and license() for information.        |
----------------------------------------------------------------------
sage: import snappy
sage: M = snappy.Manifold('m004')
sage: M.volume()
2.0298832128193069
sage: [C.homology() for C in M.covers(8, method='gap')]

[Z/21 + Z/105 + Z,
 Z/30 + Z,
 Z/30 + Z,
 Z/3 + Z/3 + Z + Z,
 Z/3 + Z + Z,
 Z/3 + Z/3 + Z + Z,
 Z/3 + Z + Z,
 Z/3 + Z/3 + Z + Z,
 Z/5 + Z + Z,
 Z + Z]

SnapPy does have some Sage specific features as you can see above.  I
plan on making an spkg for it eventually.

Best,

Nathan
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