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Tue Oct 21 19:39:10 EDT 2003 · https://mail.python.org/pipermail/python-dev/2003-October/039226.html

Guido:
> Personally, I still like the idea best to make
> 
>     (x for x in S)
> 
> be an iterator comprehension
> 
> and
> 
>     [x for x in S]
> 
> syntactic sugar for the common operation
> 
>     list((x for x in S))

FWIW, that's enough to switch my vote for generator expressions from
-0 to +0.  If they work this way then there is essentially no extra
complexity in the language.  It's important to look at things from
the perspective of a new Python programmer, I think.

Another nice thing is that we have tuple and dict comprehensions
for free:

  tuple(x for x in S)
  dict((k, v) for k, v in S)
  Set(x for x in S)

Aside from the bit of syntactic sugar, everything is nice an
regular.

  Neil

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[Python-Dev] accumulator display syntax