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This should be compared to the constant folding already 
added to Py2.5 via the peepholer:
   dis.dis(compile('x=2+3', '', 'exec'))

Also, make sure it doesn't go over the top consuming 
memory for the likes of:

  '-' * 100
  (None,)*2000

Both of those should not be optimized away at compile-time.

Also, be sure not optimize away -0.0.  Thet is not the 
same as +0.0.  The distinction is important for branch 
cuts in cmath.