Terry Reedy <[email protected]> wrote:
> Constant tuples (a tuple whose members are all seen as constants by the
> compiler) are now pre-compiled and constructed once and put into the
> code object as such rather than re-constructed with each run of the code.
Sadly that's not entirely accurate.
Tuples whose members are all simple constants are pre-compiled, but here's
an example of a tuple whose members are all constants but doesn't get
optimised:
>>> def foo():
data = (
('hello', 42),
('world', 24),
)
return data
>>> import dis
>>> dis.dis(foo)
3 0 LOAD_CONST 5 (('hello', 42))
4 3 LOAD_CONST 6 (('world', 24))
6 BUILD_TUPLE 2
9 STORE_FAST 0 (data)
6 12 LOAD_FAST 0 (data)
15 RETURN_VALUE
--
Duncan Booth http://kupuguy.blogspot.com
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