On Saturday, 3 March 2018 17:16:14 UTC, Ned Batchelder wrote:
> On 3/2/18 10:36 AM, Paul Moore wrote:
> > Or (real Python):
> >
> > def fn():
> > for i in range(10000):
> > with open(f"file{i}.txt", "w") as f:
> > f.write("Some text")
> >
> > How would you write this in your RAII style - without leaving 10,000
> > file descriptors open until the end of the function?
>
> IIUC, if the OP's proposal were accepted, the __del__ method would be
> called as soon as the *value*'s reference count went to zero. That means
> this wouldn't leave 10,000 files open, since each open() would assign a
> new file object to f, which would make the previous file object's ref
> count be zero, and it would be closed.
You have understood correctly. Here is the equivalent RAII version:-
def fn():
for i in range(10000):
f = RAIIFile(f"file{i}.txt", "w")
f.write("Some text")
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