Terry Reedy wrote:
Some people write
somename = lambda args: expression
instead of the more obvious (to most people) and, dare I say, standard
def somename(args): return expression
Visually I find the second form very ugly.
The colon indicates to me that a new line is expected, and breaking that
expectation breaks my flow of code reading.
I very *rarely* use lambdas in the form you show, but where you do I
prefer them to the single line function.
Michael Foord
The difference in the result (the only one I know of) is that the code and
function objects get the generic name '<lambda>' instead of the more
informative (in repr() output or tracebacks) 'somename'. I consider this a
disadvantage.
In the absence of any compensating advantages (other than the trivial
saving of 3 chars), I consider the def form to be the proper Python style
to the point I think it should be at least recommended for the stdlib in
the Programming Recommendations section of PEP 8.
There are currently uses of named lambdas at least in urllib2. This to me
is a bad example for new Python programmers.
What do our style mavens think?
Terry Jan Reedy
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