Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

Few years ago I experimented with a special opcode for exception matching. It 
could make the bytecode a tiny bit smaller and faster, but since catching an 
exception in Python is relatively expensive, it would not have significant 
performance benefit.

As for splitting COMPARE_OP for comparison, identity and containment tests, all 
these operations look the same from the compiler side, they correspond the same 
AST node. Introducing new opcodes will complicate the compiler.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue39156>
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