Calling pandas deprecated method

[RomaKoks]

featuretools/featuretools/computational_backends/feature_set_calculator.py

Line 153 in 72f042e

df = default_df.append(df, sort=True)

The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.

pandas.__version__
1.5.3

[RomaKoks]

FutureWarning in addition to previous:

featuretools/computational_backends/feature_set_calculator.py:797: FutureWarning: Not prepending group keys to the result index of transform-like apply. In the future, the group keys will be included in the index, regardless of whether the applied function returns a like-indexed object.
To preserve the previous behavior, use

	>>> .groupby(..., group_keys=False)

To adopt the future behavior and silence this warning, use 

	>>> .groupby(..., group_keys=True)
  to_merge = base_frame.groupby(