Message322306
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). |
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Date |
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2018-07-24 14:47:54 | eryksun | set | recipients:
+ eryksun, opstad |
2018-07-24 14:47:54 | eryksun | set | messageid: <1532443674.62.0.56676864532.issue34208@psf.upfronthosting.co.za> |
2018-07-24 14:47:54 | eryksun | link | issue34208 messages |
2018-07-24 14:47:54 | eryksun | create | |
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