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()

DataFrame.rfloordiv(other, axis='columns', level=None, fill_value=None)

Rolling.std(ddof=1, *args, **kwargs)

DataFrame.ftypes Return the ftypes (indication of sparse/dense and dtype) in this object.

DatetimeIndex.dayofyear The ordinal day of the year

Series.str.count(pat, flags=0, **kwargs)