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bpo-39320: Handle unpacking of **values in compiler#18141
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markshannon merged 6 commits intoJan 27, 2020
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* Add DICT_UPDATE and DICT_MERGE bytecodes. Use them for ** unpacking. * Remove BUILD_MAP_UNPACK and BUILD_MAP_UNPACK_WITH_CALL, as they are now unused. * Update magic number for ** unpacking opcodes. * Update dis.rst to incorporate new bytecodes. * Add blurb entry.
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This is the second part of the implementation of bpo-39320.
Part 1 was #17984
This PR replaces BUILD_MAP_UNPACK and BUILD_MAP_UNPACK_WITH_CALL
with DICT_MERGE and DICT_UPDATE.
DICT_UPDATE ncallsitem_n.update(tos)whereitem_nis thenth item on the stack andtosis popped from the stack.DICT_MERGE nis the same, but raises an exception if there are duplicate keys.https://bugs.python.org/issue39320