On 11/18/2016 12:42 PM, Ram Rachum wrote:
Sure, here are a couple of use cases:
1. I'm making a program that lets people lease machines. They can issue
a command to lease 7 machines. When they do, my program leases them one
by one and adds them all to an exit stack, so in case there aren't 7
machines available, all the machines we leased get released and the
situation is back to normal. If everything goes fine, I do pop_all on
the exit stack so it doesn't get exited and the machines stay leased,
then the command exits and the user gets his machines.
So you're using the contextlib.ExitStack context manager?
2. I have a test suite that creates a temporary folder to put files that
are used by the test. The temporary folder is created by a context
manager that deletes it at the end. But, if the test fails I want to
move the temporary folder away into a dedicated folder for the user to
be able to examine those files later to figure out why the test fails.
So I want to tell the temporary folder context manager to not delete
the folder, because it'll fail since it was moved away so it's not at
the expected location.
My first thought is to make a custom context manager for this use-case, but if
you really want to use a generator instead can't you just put in an existence
check for the directory and only delete if it is still there?
--
~Ethan~
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