[Python-Dev] Let's just *keep* lambda

"Martin v. Löwis" martin at v.loewis.de
Thu Feb 9 17:39:31 CET 2006

Jiwon Seo wrote:
> Apparently, simplest example is,
> collection.visit(lambda x: print x)

Ok. I remotely recall Guido suggesting that print should become
a function.

It's not a specific example though: what precise library provides
the visit method?

> which currently is not possible. Another example is,
> map(lambda x: if odd(x): return 1
>                       else: return 0,
>         listOfNumbers)

Hmm. What's wrong with

map(odd, listOfNumbers)

or, if you really need ints:

map(lambda x:int(odd(x)), listOfNumbers)

> Also, anything with exception handling code can't be without explicit
> function definition.
> collection.visit(lambda x: try: foo(x); except SomeError: error("error
> message"))

That's not a specific example.


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