Eryk Sun <[email protected]> added the comment:
Please refrain from using the issue tracker to satisfy your curiosity. This is
a question about compiler optimizations that should be asked on python-list, or
maybe python-dev.
You can use the dis module to get a superficial answer in terms of the
constants in the code object.
3.6:
>>> dis.dis('(100 * 20) is 2000')
1 0 LOAD_CONST 3 (2000)
2 LOAD_CONST 2 (2000)
4 COMPARE_OP 8 (is)
6 RETURN_VALUE
3.7:
>>> dis.dis('(100 * 20) is 2000')
1 0 LOAD_CONST 0 (2000)
2 LOAD_CONST 0 (2000)
4 COMPARE_OP 8 (is)
6 RETURN_VALUE
The argument of the LOAD_CONST opcode is the index of the constant in the code
object's co_consts tuple. In 3.6 you can see it's separate int objects, but in
3.7 the operation uses the same int object (index 0).
----------
nosy: +eryksun
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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<https://bugs.python.org/issue34208>
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