added pandas table reader along with test

[swapdewalkar]

Address Issue #407

Reader for PandasTable
pd.read_table

Changes

Add PandasTableReader and tests

How I tested this

unit tests

Notes

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[skrawcz]

For the 3.8 tests:

hamilton/plugins/pandas_extensions.py:1546: in PandasTableReader
header: Union[int, Sequence[int], str, None] = 'infer'
E TypeError: 'ABCMeta' object is not subscriptable

I think the error is because you have Sequence[int]. If you remove the [int] I think it'll work.

[skrawcz]

Same for these ones, my guess it's Iterable:

na_values: Optional[Union[Hashable, Iterable[Hashable], Dict[Hashable, Iterable]]] = None

[skrawcz]

@swapdewalkar sorry you need to rebase this before I can merge it.

[skrawcz]

needs a rebase and then we can merge it.

[skrawcz]

@swapdewalkar just giving you a gentle nudge for the rebase please :)

[skrawcz]

Thanks @swapdewalkar !