DOC: index described as a "set" but permits duplicates -- change to multiset or list?

[notestaff]

Location of the documentation

https://pandas.pydata.org/pandas-docs/stable/reference/indexing.html

Documentation problem

Index is described as a "set", but behaves as a multiset: len() counts each occurrent of a duplicate element separately.

Also, Index is described as an "ordered set", but that term connotes a set with an order relation on the values of its elements.

Suggested fix for documentation

An index seems more like an immutable ordered list; maybe, describe it as that?

[dsaxton]

Thanks @notestaff, this does seem like an odd description. "Immutable ndarray implementing an ordered, sliceable set.", but it's neither an ndarray, ordered, or a set. A PR to update the docs would be helpful.

[onshek]

I'm willing to take this.

[Nikhil1O1]

i would be glad to make my first contribution here

[Nikhil1O1]

take

[Nikhil1O1]

There's no indexing.html present in my clone... However, I found \pandas\doc\source\reference\indexing.rst but
this is not what we are looking for
Please help me to pinpoint its location
@notestaff @dsaxton

[dsaxton]

@Nikhil1O1 It looks like the docs you'd want to update are in two places (this description is used for a few different classes): /pandas/core/indexes/base.py and /pandas/core/indexes/numeric.py

[Nikhil1O1]

Done, If there's anything else I can do... Do let me know.