Hi. I am working on a kinda-ORM library, which usage often implies to request data within specific ranges:

     Foobar.search(
        attr1="foo",
        attr2=gt(10),
        attr3=between(42, 50)
    )

The use of "gt" or "between" methods to describe those operations feels a bit cumbersome (as it is long to write, and you need to import those functions in a lot of files), and I though it could be more pythonic to use slices instead.

     Foobar.search(
        attr1="foo",
        attr2=slice(10),
        attr3=slice(42, 50)
    )

I suggest an alternative way to instanciate slices, that would look like this:

     Foobar.search(
        attr1="foo",
        attr2=[10:],
        attr3=[42:50]
    )

What do you think?
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