perspective-python 4.4.1

A data visualization and analytics component, especially well-suited for large and/or streaming datasets.
Documentation 
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#  ┃ ██████ ██████ ██████       █      █      █      █      █ █▄  ▀███ █       ┃
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#  ┃ Copyright (c) 2017, the Perspective Authors.                              ┃
#  ┃ ╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌ ┃
#  ┃ This file is part of the Perspective library, distributed under the terms ┃
#  ┃ of the [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0). ┃
#  ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

import perspective as psp

client = psp.Server().new_local_client()
Table = client.table


class TestToArrowLZ4(object):
    def test_to_arrow_lz4_roundtrip(self, superstore):
        original_tbl = Table(superstore.to_dict(orient="records"))
        arrow_uncompressed = original_tbl.view().to_arrow(compression=None)

        tbl = Table(arrow_uncompressed)
        arr = tbl.view().to_arrow(compression="lz4")
        assert len(arr) < len(arrow_uncompressed)
        tbl2 = Table(arr)
        arr2 = tbl2.view().to_arrow(compression=None)
        assert len(arr2) > len(arr)
        tbl3 = Table(arr)
        arr3 = tbl3.view().to_arrow(compression="lz4")
        assert len(arr3) == len(arr)