On Sun, Sep 4, 2016 at 8:03 AM, Yury Selivanov <yselivanov...@gmail.com> wrote:
> On 2016-09-03 12:27 PM, Brett Cannon wrote:
>>
>> Below is the `co_extra` section of PEP 523 with the update saying that
>> users are expected to put a tuple in the field for easier simultaneous use
>> of the field.
>>
>> Since the `co_extra` discussions do not affect CPython itself I'm planning
>> on landing the changes stemming from the PEP probably on Monday.
>
>
> Tuples are immutable. If you have multiple co_extra users then they will
> have to either mutate tuple (which isn't always possible, for instance, you
> can't increase size), or to replace it with another tuple.
Replace it, but only as they register themselves with a particular
function. Imagine a profiler doing something vaguely like this:
class FunctionStats:
def __init__(self):
self.info = [whatever, whatever, blah blah]
def profile(func):
"""Decorator to mark a function for profiling"""
func.__code__.co_extra += (FunctionStats(),)
return func
Tuple immutability impacts the initialization only. After that, you
just iterate over it.
ChrisA
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