I just fixed it in the patch on #7496:
sage: var('2x')
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/home/vbraun/opt/sage-4.7.1.alpha2/devel/sage-main/<ipython console> in
<module>()
/home/vbraun/Sage/sage/local/lib/python2.6/site-packages/sage/calculus/var.so
in sage.calculus.var.var (sage/calculus/var.c:687)()
/home/vbraun/Sage/sage/local/lib/python2.6/site-packages/sage/symbolic/ring.so
in sage.symbolic.ring.SymbolicRing.var (sage/symbolic/ring.cpp:6276)()
/home/vbraun/Sage/sage/local/lib/python2.6/site-packages/sage/symbolic/ring.so
in sage.symbolic.ring.SymbolicRing.var (sage/symbolic/ring.cpp:6048)()
ValueError: The name "2x" is not a valid Python identifier.
sage:
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