Barry A. Warsaw <[email protected]> added the comment:
I wasn't even aware that pop_all() tries to create the concrete subtype. I
wonder how common subclassing ExitStack is in practice. (Of course, the answer
is that we'll never know.)
For 3.7, we should probably delegate instance creation to a new non-private
method, e.g.
new_stack = self._make_instance()
so *if* you subclass, you can create the new ExitStack subclass instances any
way you want. I would then change the default implementation to make an
ExitStack() explicitly, as per the current documentation.
+1 for fixing the recipe and not changing the code for 3.6. You might want to
add a note describing the current behavior for <= 3.6 and indicating that this
will change for 3.7+
Finally, while you're at it, is there any reason not to change the recipe to
use:
super().__init__()
instead?
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