DatetimeIndex.is_quarter_start Logical indicating if first day of quarter (defined by frequency)

MultiIndex.memory_usage(deep=False)

CategoricalIndex.memory_usage(deep=False)

TimedeltaIndex.holds_integer()

DatetimeIndex.base return the base object if the memory of the underlying data is shared

DatetimeIndex.size return the number of elements in the underlying data

CategoricalIndex.strides return the strides of the underlying data

Panel.keys()

Series.str.isalpha()

Panel.iteritems()