piso

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DOC: Typos

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`piso/docs/user_guide/intervalsets.rst` Two typos in this doc Note that if a interval array . :class:`pandas.array.IntervalArray`

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ENH: Support for both close

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#### Is your feature request related to a problem? ``` import pandas as pd import piso piso.register_accessors() arr = pd.arrays.IntervalArray.from_tuples( [(1,5), (3,6), (2,4)], closed="both") arr.piso.intersection() ``` #### Describe the solution...

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#### Describe the solution you'd like Add new top-level function into ndframe.py - piso.from_frame It allows fast creation of interval arrays from vector data in dataframes #### Additional context sig:...

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#### Describe the solution you'd like Constructed from an interval array. See bottom of https://upload.wikimedia.org/wikipedia/commons/a/ac/Interval_graph.svg Use matplotlib. Can accept labels for the graph.

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#### Describe the solution you'd like See top image in https://upload.wikimedia.org/wikipedia/commons/a/ac/Interval_graph.svg Use matplotlib. Labels should be able to be provided.

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#### Describe the solution you'd like Use lru_cache. Convert interval arrays to tuples for hashing purposes. Should we have a method which turns caching on or off? #### Additional context...

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sources: https://docs.python.org/3/library/typing.html https://mypy.readthedocs.io/en/stable/cheat_sheet_py3.html https://realpython.com/lessons/type-hinting/ https://github.com/staircase-dev/staircase/blob/master/staircase/_typing.py has been created for custom types (see https://github.com/pandas-dev/pandas/blob/master/pandas/_typing.py for inspiration)

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