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Thu Sep 19 22:54:08 CEST 2013 · https://mail.python.org/pipermail/python-dev/2013-September/128798.html

I think the lambda keyword is difficult to understand for many people. It
would be more pythonic to use an empty def call instead.

For instance this:

    words.sort(key = lambda x: x[2])

could look like this:

    words.sort(key = def (x): x[2])

It's obvious and explicit that we're creating an unnamed, anonymous
function this way.
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[Python-Dev] Use an empty def as a lambda