[Python-Dev] Re: "groupby" iterator

[Christos Georgiou]

Guido van Rossum said:

>> The nasty thing about it is that it smells a bit too much like a
>> clever trick. It's really abusing the syntax to make it mean
>> something different from what it usually means.
>
>It is also somewhat weak in that it only addresses lambdas with one
>argument, and only allows a single reference to that argument in the
>resulting expression, and can't really be made to handle method calls
>without more gross notational hacks -- even though it *can* be made to
>handle arbitrary binary and unary operators.

A minor correction: the Voodoo approach handles fine method calls by
defining a __call__ method in the Voodoo class; it can't handle
*function* calls in an elegant way:

lambda x: x.startswith("text")
This works fine as:
Voodoo().startswith("text")

lambda x: math.sin(x)
This needs gross syntax, the following does not work:
math.sin(Voodoo())
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