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Wed Mar 4 17:41:47 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-March/086721.html

Lie Ryan wrote:

> Isn't ordered dictionary essentially also an "always sorted" container? 
> It is always sorted depending on the order of insertion? I can't see any 
> technical reason why the data structure can't accommodate them both. Can 
> you point me to a discussion on this?

Appending an item at the end of a sequence is O(1), no search required. 
  Inserting an item at a random 'sorted' point requires at best an 
O(logN) search.  Insertion itself is O(1) to O(N) depending on the 
structure.

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Showing content from https://mail.python.org/pipermail/python-dev/2009-March/086721.html below:

[Python-Dev] PEP 372 -- Adding an ordered directory to collections ready for pronouncement