On Sat, Feb 8, 2020 at 1:22 PM Chris Angelico <ros...@gmail.com> wrote:
> On Sun, Feb 9, 2020 at 8:04 AM Random832 <random...@fastmail.com> wrote:
> >
> > On Fri, Feb 7, 2020, at 13:03, Todd wrote:
>
> > What if you could write pickle.dump(myobj, with open('myfile.p', 'wb'))?
> >
> > Or other similar examples such as (with open('myfile')).read() - have
> the compiler automatically transform the code into equivalent to wrapping
> the statement in a with block.
> >
>
> Exactly how much code would be wrapped in the 'with' block?
>
This is an intriguing idea, and in the example it's fairly easy to wrap the
entire statement in the with block. It gets a bit more complicated with
short-circuit logic. This is a contrived example to make it easier to read:
result = (with alpha()) and ((with beta()) if (with gamma()) else
(with delta()))
needs to be interpreted something like:
with _alpha := alpha():
if _alpha:
with _gamma:= gamma():
if _gamma:
with _beta := beta():
result = beta
else:
with _delta := delta():
result = delta
else:
result = _alpha
I don't think there's anything surprising there although precisely defining
the semantics will be a little tricky.
--- Bruce
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