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Mon Oct 27 16:20:26 EST 2003 · https://mail.python.org/pipermail/python-dev/2003-October/039652.html

At 04:13 PM 10/27/03 -0500, Raymond Hettinger wrote:
>There was occasional discussion about the parentheses requirement but
>that was quickly settled also.  One idea that had some merit was to not
>require the outer parentheses for a single expression on the rhs of an
>assignment:
>
>     g = (x**2 for x in range(10))   # maybe the outer parens are not
>needed

FWIW, I think the parentheses add clarity over e.g.

g = x**2 for x in range(10)

As this latter formulation looks to me like g will equal 81 after the 
statement is executed.

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Showing content from https://mail.python.org/pipermail/python-dev/2003-October/039652.html below:

[Python-Dev] PEP 289: Generator Expressions