frame.append method deprecation in pandas
lib/python3.11/site-packages/pychiver/waveform.py:138: FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.
lib/python3.11/site-packages/pychiver/waveform.py:138: FutureWarning: The frame.append method is deprecated and will be removed from pandas in a future version. Use pandas.concat instead.