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python-2.x has a list of non-essential built in functions but python-3.x has no such list, and clearly there are built in functions in python-2.x that are no longer in python-3.x. Is there a list somewhere of all the python-2.x built in functions that were removed in python-3.x?

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The list of removed built-ins in 3.0 can be found here.

There are a few functions that were renamed:

  • intern() was moved to sys.intern().
  • raw_input() was renamed to just input(). The old behaviour can be emulated by using eval(input()).
  • reduce() was moved to functools.reduce().
  • reload() was moved to imp.reload() in 3.0, and subsequently moved to importlib.reload in 3.4.
  • xrange() was renamed to range(), replacing the old range() builtin.

And one function resurrected:

  • callable(), which was removed in 3.0 and resurrected in 3.2.
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Couple omissions from "renamed" list: reduce -> functools.reduce, and a multistep rename, reload -> imp.reload (3.0+, deprecated in 3.4) -> importlib.reload (3.4+). Few people used the former, but the latter is commonly used in interactive sessions during development, I usually tweak my PYTHONSTARTUP file (executed only for interactive sessions) to automatically do from importlib import reload so I can use it without explicitly importing or qualifying it.
@ShadowRanger Added!
xrange() to range() is another significant one.
Thanks! This is what I was looking for.
Note: Py3's range is better than Py2's xrange. For one, from the start, it had no value or size limits; xrange couldn't produce values outside the range of a C ssize_t, and couldn't have a total number of items greater than SSIZE_MAX. Py3.0 range has no such limits (though you can't take the len if it exceeds SSIZE_MAX), and in later 3.x releases they made other improvements, like O(1) membership testing and logical equality testing, support for slicing, etc.
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