[Python-Dev] Retrieve an arbitrary element from a set withoutremoving it (original) (raw)

Willi Richert w.richert at gmx.net
Fri Oct 30 09:16:02 CET 2009

Am Freitag, 30. Oktober 2009 03:58:16 schrieb Steven D'Aprano:

To clarify point 3, given:

x = set.get() y = set.get() then x and y will only be the same element if set has length one. However, given: x = set.get() set.add(el) set.remove(el) y = set.get() there are no guarantees about x and y being different. I believe that the patch supplied by Willi Richart implemented these behaviours. http://bugs.python.org/issue7212

Actually, no. The patch makes no assumption about x and y being different.

It does not try to extend the core functionality of set nor does it need to maintain any state that would be necessary for that.

It is just a more obvious and cleaner way for saying "for x in some_set: break". So, as Raymond says, it is the Pythonic version of "arb" in setl.

wr

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