Tim Peters <[email protected]> added the comment:
I hate this change :-( The code generated for something like this today:
def f():
if 0:
x = 1
elif 0:
x = 2
elif 1:
x = 3
elif 0:
x = 4
else:
x = 5
print(x)
is the same as for:
def f():
x = 3
print(x)
No tests or jumps at all. That made the optimization an extremely efficient,
and convenient, way to write code with the _possibility_ of using different
algorithms by merely flipping a 0 and 1 or two in the source code, with no
runtime costs at all (no cycles consumed, no bytecode bloat, no useless
unreferenced co_consts members, ...). Also a zero-runtime-cost way to
effectively comment out code blocks (e.g., I've often put expensive debug
checking under an "if 1:" block).
----------
nosy: +tim.peters
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Python tracker <[email protected]>
<https://bugs.python.org/issue37500>
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