1. http://bugs.python.org/issue27129 Make the bytecode more 16-bit oriented.
2. http://bugs.python.org/issue27140Add new opcode BUILD_CONST_KEY_MAP for building a dict with constant keys. This optimize the common case and especially helpful for two following issues (creating and calling functions).
3. http://bugs.python.org/issue27095Simplify MAKE_FUNCTION/MAKE_CLOSURE. Instead packing three numbers in oparg the new MAKE_FUNCTION takes built tuples and dicts from the stack. MAKE_FUNCTION and MAKE_CLOSURE are merged in the single opcode.
4. http://bugs.python.org/issue27213Rework CALL_FUNCTION* opcodes. Replace four existing opcodes with three simpler and more efficient opcodes.
5. http://bugs.python.org/issue27127 Rework the for loop implementation. 6. http://bugs.python.org/issue17611Move unwinding of stack for "pseudo exceptions" from interpreter to compiler.
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