Alternative to multi-line lambdas: Assign-anywhere def statements

Wed Feb 11 21:57:20 EST 2015

On Wed, Feb 11, 2015 at 7:06 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>> I can't see why the parser would understand more easily
>>>> def f(x):
>> return x**2
>> than
>>>> f = x->
>> return x**2
>>> The parser parses both equally well. That is not the issue.

The compiler could at some point recognize that the function is being
assigned to a simple name and transform the assignment into a def for
purposes of byte code generation. It could also do the same with
lambda, although it currently doesn't.
The reason I don't like this replacing def isn't because the name is
necessarily lost. It's because the lack of the well-defined def
statement encourages more complex usages like
 functions['f'] = x -> x**2
where such implicit transformations won't work.