weakrefs and avoiding bad gc cycles

[Aaron Bentley]

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On 11-05-31 11:32 PM, Robert Collins wrote:
> That said, for some things even a fraction of a second will matter.
> One such case is when you have a file open in a directory that is
> going to be deleted - that file -must- be closed before the directory
> cleanup will fail on Windows. Other cases exist around threads and
> sockets. AFAIK all such cases have OS resources involved for them to
> matter.

Context managers are an excellent fit for this case.  They're quite
similar to Resource Acquisition Is Instantiation for Python.  Except
that it uses __enter__ / __exit__, not __init__ / __del__.  And new bzr
development can freely use them .

>  - So if you need to guarantee free/close/whatever before some other
> operation takes place then we have to manually arrange for that to
> take place.

Where "manually" can mean "by using a with statement".

Aaron
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