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Wed Aug 11 15:57:41 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-August/047614.html

My patch (attached) accepts
>
>   import (os, sys)
>   from sys import (stdin, stdout, stderr)
>   import (os)
>   from sys import (*)
>
> but rejects
>
>   from (sys) import stdin
>   import (os), (sys)
>   import (os,)
>
> Should any of those be allowed? Anything that I missed?

Others have already mentioned that "from sys import xxx, xxx, xxx"
is the case that badly needs line wrapping. I would, however, like
to suggest that (if it's easy to do) you allow a trailing comma when
parenthesees are used. Of course this looks silly:

   from mymodule import (xxx, xxx,
           xxx, xxx,)

But in the most extreme case, like this:

   from myBigModule import (
           xxxxxxxx, xxxxxxxx, xxxxxxxx,
           xxxxxxxx, xxxxxxxx, xxxxxxxx,
           xxxxxxxx, xxxxxxxx, xxxxxxxx,
           xxxxxxxx, xxxxxxxx, xxxxxxxx,
           xxxxxxxx, xxxxxxxx, xxxxxxxx,
           )

it's awefully nice on cut-and-paste to allow the trailing comma. But
the most important reason for doing so is that Python already allows
(and disregards) an extra trailing comma in similar lists:

    >>> [1,2,3,]
    [1, 2, 3]
    >>> {1:1,2:2,3:3,}
    {1: 1, 2: 2, 3: 3}
    >>> def func(a,b,c,):
    ...     print a, b, c
    ...
    >>> func(1,2,3)
    1 2 3
    >>> (1,2,3,)
    (1, 2, 3)

-- Michael Chermside

PS: The length-one-tuple is a special case (and a bit of a wart)
 in that it MANDATES the use of the trailing comma. But that's
 got nothing to do with the basic principle.

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Showing content from https://mail.python.org/pipermail/python-dev/2004-August/047614.html below:

[Python-Dev] Multi-line import implementation (was: 2.4a2, and @decorators)