Any objections to new peephole transformation that merges a store/load pair into a single step? There is a tested patch at: www.python.org/sf/1144842 It folds the two steps into a new opcode. In the case of store_name/load_name, it saves one three byte instruction, a trip around the eval-loop, two stack mutations, a incref/decref pair, a dictionary lookup, and an error check (for the lookup). While it acts like a dup followed by a store, it is implemented more simply as a store that doesn't pop the stack. The transformation is broadly applicable and occurs thousands of times in the standard library and test suite. Raymond Hettinger
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