Added feature to create table directly from Pandas DataFrame

[nik849]

Added new method to the api, accepts a pandas DataFrame object and returns a new table object.

[coveralls]

Coverage decreased (-3.09%) to 96.907% when pulling 1b061b0 on nik849:master into 9050929 on tommyip:master.

[nik849]

Sorry, hadn't thought about the test coverage, I'll sort that out and add it to this.

[coveralls]

Coverage decreased (-3.09%) to 96.907% when pulling 86f9994 on nik849:master into 9050929 on tommyip:master.

[tommyip]

Hey @nik849 thanks for working on this! I am thinking if it would be better to add a new argument to the new() constructor instead of a new api, like:

def new(headings: Optional[List[Any]] = None,
        data: Optional[List[List[Any]]] = None,
        style: Text = 'default',
        device: Text = 'stdout',
        dataframe: Optional[Pandas.DataFrame] = None) -> TableD:
...

>>> tabled.new(dataframe=new_df)

Looks great otherwise, just need some tests.

[nik849]

@tommyip , great, I will do that, I think it will be a fair bit neater that way. I think it will also be easier to test.

[tommyip]

Looks great, I think the conversion should happen in the api function instead of the TableD constructor, but it is fine otherwise. Just need some test and then I am happy to merge this, I can do that if you like.

[nik849]

Ok, I'll swap those bits round and commit those, could you write the test method? I'm not that familiar with the testing side. I'll do it now, thanks

[tommyip]

Thanks @nik849, merged your changes to e72684d !

[nik849]

@tommyip, great, thanks!