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PyObject* PySequence_Fast (PyObject *o, const char *m)

Return value: New reference. 

Returns the sequence o as a tuple, unless it is already a tuple or list, in
which case o is returned. Use PySequence_Fast_GET_ITEM() to access the members
of the result. Returns NULL on failure. If the object is not a sequence, raises
TypeError with m as the message text.

This implies to me that it will work for any sequence, and a quick test just
convinced me that PySequence_Fast() works with o = xrange(n), even if traversed
twice. See:

http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/cctbx/cctbx/misc/Attic/container_from_list_or_tuple.py?rev=1.1.2.2&only_with_tag=boost_python_v2_transition&content-type=text/vnd.viewcvs-markup

Ralf


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