New submission from Charles-François Natali:
This adds a keys() method to selectors, to return all the registered keys.
It's useful, because one often needs to loop until all registered file objects
have been unregistered e.g. (inspired from subprocess, see #18923):
while selector.keys():
for key, events in selector.select():
# process events
also, it can be useful if you want e.g. the list of all currently logged users,
etc. It avoids having to maintain a separate data-structure tracking registered
file objects.
The patch attached returns a new set upon each call: another way to handle this
would be to just return the dictionary's .values() view: it would be faster and
use less memory, but it's immutable and also this would prevent the user from
doing:
for key in selectior.keys():
if somecondition:
selector.unregister(key.fileobj)
(since you'll get "dictonary changed size during iteration").
----------
components: Library (Lib)
files: selectors_keys.diff
keywords: needs review, patch
messages: 198988
nosy: haypo, neologix, pitrou
priority: normal
severity: normal
stage: patch review
status: open
title: selectors: add keys() method
type: enhancement
versions: Python 3.4
Added file: http://bugs.python.org/file31965/selectors_keys.diff
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<http://bugs.python.org/issue19172>
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