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Thu Aug 1 21:41:19 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-August/127718.html

Chris Angelico writes:
 > On Thu, Aug 1, 2013 at 5:58 PM, Alexander Shorin <kxepal at gmail.com> wrote:
 > > fun = lambda i: i[1]
 > > for key, items in groupby(sorted(items, key=fun), key=fun):
 > >   print(key, ':', list(items))
 > 
 > I'd do a direct translation to def here:
 > 
 > def fun(i): return i[1]
 > for key, items in groupby(sorted(items, key=fun), key=fun):
 >   print(key, ':', list(items))

As long as it's about readability, why not make it readable?

    def second(pair): return pair[1]
    for key, items in groupby(sorted(items, key=second), key=second):
        print(key, ':', list(items))

I realize it's somewhat unfair (for several reasons) to compare that
to Alexander's "fun = lambda i: i[1]", but I can't help feeling that
in another sense it is fair.

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[Python-Dev] Lambda [was Re: PEP 8 modernisation]