Pytest fails on master branch

[consideRatio]

There is a pytest failure in the master branch, and I'm not sure how to fix it. I concluded it occur on master with pandas=1 and pandas<1. It feels bad to make another release before this is fixed or understood.

Duplicated issue

• 'Series' object has no attribute 'freqstr' in example 9 (Period index and Period column) in binder launch example #274

pytest error logs

============================================= FAILURES ==============================================
_____________________________________ test_period_object_column _____________________________________

    def test_period_object_column():
        range_index = pd.period_range(start="2000", periods=10, freq="B")
        df = pd.DataFrame({"a": 5, "b": range_index}, index=range_index)
>       view = QgridWidget(df=df)

qgrid/tests/test_grid.py:240: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
qgrid/grid.py:627: in __init__
    self._update_df()
qgrid/grid.py:820: in _update_df
    self._update_table(update_columns=True, fire_data_change_event=False)
qgrid/grid.py:966: in _update_table
    double_precision=self.precision)
/home/erik/anaconda3/lib/python3.7/site-packages/pandas/io/json/_json.py:85: in to_json
    indent=indent,
/home/erik/anaconda3/lib/python3.7/site-packages/pandas/io/json/_json.py:291: in __init__
    self.schema = build_table_schema(obj, index=self.index)
/home/erik/anaconda3/lib/python3.7/site-packages/pandas/io/json/_table_schema.py:253: in build_table_schema
    fields.append(convert_pandas_type_to_json_field(s))
/home/erik/anaconda3/lib/python3.7/site-packages/pandas/io/json/_table_schema.py:117: in convert_pandas_type_to_json_field
    field["freq"] = arr.freqstr
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = index
2000-01-03    2000-01-03
2000-01-04    2000-01-04
2000-01-05    2000-01-05
2000-01-06    2000-01-06
2000-01-07  ...1-11    2000-01-11
2000-01-12    2000-01-12
2000-01-13    2000-01-13
2000-01-14    2000-01-14
Name: b, dtype: period[B]
name = 'freqstr'

    def __getattr__(self, name: str):
        """After regular attribute access, try looking up the name
        This allows simpler access to columns for interactive use.
        """
    
        # Note: obj.x will always call obj.__getattribute__('x') prior to
        # calling obj.__getattr__('x').
    
        if (
            name in self._internal_names_set
            or name in self._metadata
            or name in self._accessors
        ):
            return object.__getattribute__(self, name)
        else:
            if self._info_axis._can_hold_identifiers_and_holds_name(name):
                return self[name]
>           return object.__getattribute__(self, name)
E           AttributeError: 'Series' object has no attribute 'freqstr'

/home/erik/anaconda3/lib/python3.7/site-packages/pandas/core/generic.py:5274: AttributeError

[gerrymanoim]

The underlying issue is pandas-dev/pandas#31917, which we didn't have the bandwidth at the time to tackle (or patch our vendored version, which I'd like to get rid of anyway).

Looks like someone started some work on it: pandas-dev/pandas#32665.

[consideRatio]

Woops! I mistakenly made this issue close by writing in the pr that got merged that this needed to be understood or fixed pre-release, i didnt mean my pr fixed this!