New submission from Ross Barnowski <ross...@berkeley.edu>:
It would be nice if there were a way to get a string representation of a slice
object in extended indexing syntax, e.g.
```
>>> myslice = slice(None, None, 2)
>>> print(myslice)
'::2'
```
One motivating use-case is in descriptive error messages, e.g.
```
TypeError(f"Can't slice {myobj}, try list({myobj})[{myslice}]")
```
In this case, it is much more natural for `myslice` to use the extended
indexing syntax than the slice str/repr.
Perhaps this could be done via __str__, or if that is too big a change, maybe
via __format__ e.g. `f"{myslice:asidx}"`
It's simple enough to write a conversion function, but this feels like a
feature that would fit best upstream. I searched the issue tracker, PRs on
GitHub, and the Python documentation and didn't see any related
issues/PRs/articles.
xref: https://github.com/networkx/networkx/pull/4304
----------
messages: 380921
nosy: rossbar
priority: normal
severity: normal
status: open
title: A string representation of slice objects with colon syntax
type: enhancement
versions: Python 3.10
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42352>
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