On Thu, Jan 21, 2021, at 18:48, Chris Angelico wrote:
> Note that slicing is NOT easy. The proposed semantics for a reversed
> enumeration would make slicing extremely odd.
What proposed semantics? You were the one who posted a pure-python
implementation that didn't bother to implement slicing.
It's easy enough to add slicing to your Enumerated class concept, though.
class Enumerated:
def __init__(self, basis, indices=None):
self.basis = basis
self.indices = indices if indices is not None else range(len(basis))
def __getitem__(self, idx):
if isinstance(idx, slice):
return Enumerated(self.basis, indices=self.indices[idx])
else:
return (self.indices[idx], self.basis[self.indices[idx]])
def __len__(self):
return len(self.indices)
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