[IronPython] lambda form

[Luis M. Gonzalez]

Regarding lambda, map and reduce, Guido Van Rossum has said several times that these built-ins are amongst its "Python regrets".

This is what he said in a recent interview:

- If you could change some things that have been done in the
  langage, what would it be ?

Drop lambda, filter, map and reduce. Make range() behave like xrange(). Make keys() and many other methods and built-ins return iterators rather than lists.

The interview is here:
http://blogs.nuxeo.com/sections/blogs/tarek_ziade/2005_04_11_guido_van_rossum
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