STINNER Victor <[email protected]> added the comment:
> The byte code could be further optimized (because this is such a
> speed-critical module! :)): (...)
You propose to replace
8 CALL_FUNCTION 1
10 POP_TOP
12 LOAD_CONST 2 (None)
14 RETURN_VALUE
with:
12 CALL_FUNCTION 1
15 RETURN_VALUE
It changes the semantics of Python. Technically, you *can* override the print()
builtin function:
vstinner@apu$ ./python
Python 3.8.0a2+ (heads/master:dc078947a5, Mar 7 2019, 12:23:23)
>>> import builtins
>>> def mock(*args, **kw): return 3
...
>>> builtins.print=mock
>>> print("hello")
3
>>> import __phello__
>>> # doesn't print anything
...
It would be possible if you ensure that print() isn't replaced.
Longer explanation:
https://fatoptimizer.readthedocs.io/en/latest/semantics.html
To use more efficient bytecode without modying the Python semantics, you need
to deoptimize if print() is replaced. I implemented that in my old FAT Python
project :-)
https://fatoptimizer.readthedocs.io/en/latest/optimizations.html#call-pure
--
I would be more interested by a tool to update/regenerate M___hello__ in
Python/frozen.c.
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<https://bugs.python.org/issue11614>
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