Jonathan and all!
Thanks for picking up on this thread, I almost given up hope that anyone
would be interested. Then it suddenly blew up :)!
Jonathan, your suggestion makes sense as a stop-gap measure for current
Python, but I'm unclear on the way forward to the new syntax:
When you say we introduce a new syntax where:
>>> value = d[K(1, 2, 3, a=4, b=5)]
>>> d[K(1, 2, 3, a=4, b=5)] = value
becomes:
>>> value = d[1, 2, 3, a=4, b=5]
>>> d[1, 2, 3, a=4, b=5] = value
somehow the interpreter would need to know that the intent is to create
an instance of 'K'. How is that association expressed? Or is the idea
that - the same was as slices - there would be a predefined object
within the language that is always the thing that gets created in these
instances?
It appears to me that the current behavior is:
d[32] becomes d.__getitem__(32)
d[2,4,"boo"] becomes d.__getitem__( (2,4,"boo") )
d[2:3:"boo"] becomes d.__getitem__( slice(2,3,"boo") )
So then maybe
d[2,4,scare="boo"] could become d.__getitem__( {0:2, 1:4,
"scare":"boo"} )?
That is of course quite a bit different from the args, kwargs syntax,
but I don't think it's invalid as positional arguments would get an
integer key while keyword arguments would get a string key.
With this change, of course your previous (current python) syntax would
make K into a function as opposed to a class:
def K(*args, **kwargs):
ret_val = {}
for idx, value in enumerate(args):
ret_val[idx] = value
for key, value in kwargs.items():
assert isinstance(key, str)
ret_val[key] = value
return ret_val
>>> value = d[K(1, 2, 3, a=4, b=5)]
>>> d[K(1, 2, 3, a=4, b=5)] = value
Thanks again,
Andras
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