DataFrame.first_valid_index()
DataFrame.is_copy = None
DataFrame.ftypes Return the ftypes (indication of sparse/dense and dtype) in this object.
DataFrame.as_blocks(copy=True)
DataFrame.rfloordiv(other, axis='columns', level=None, fill_value=None)
DataFrame.sub(other, axis='columns', level=None, fill_value=None)
DataFrame.convert_objects(convert_dates=True, convert_numeric=False, convert_timedeltas=True, copy=True)
DataFrame.round(decimals=0, *args, **kwargs)
DataFrame.to_json(path_or_buf=None, orient=None, date_format='epoch', double_precision=10, force_ascii=True, date_unit='ms', default_handler=None
DataFrame.stack(level=-1, dropna=True)
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