Author eric.snow
Recipients Arfrever, alex, amaury.forgeotdarc, asvetlov, brett.cannon, brian.curtin, chris.jerdonek, christian.heimes, eric.araujo, eric.snow, meador.inge, pitrou, pjenvey, serhiy.storchaka, terry.reedy, zach.ware
Date 2013-01-25.21:18:18
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Also missing a pure-Python implementation:

collections.defaultdict (relatively trivial)

In the spirit of what Brett said, I found that PyPy has an implementation already:

Jython and IronPython do not have pure Python implentations:
Date User Action Args
2013-01-25 21:18:19eric.snowsetrecipients: + eric.snow, brett.cannon, terry.reedy, amaury.forgeotdarc, pitrou, christian.heimes, pjenvey, eric.araujo, Arfrever, alex, brian.curtin, asvetlov, meador.inge, chris.jerdonek, zach.ware, serhiy.storchaka
2013-01-25 21:18:19eric.snowsetmessageid: <>
2013-01-25 21:18:19eric.snowlinkissue16651 messages
2013-01-25 21:18:18eric.snowcreate