Series.dt.daysinmonth The number of days in the month New

Series.str.isdigit()

Series.itemsize return the size of the dtype of the item of the underlying data

Series.where(cond, other=nan, inplace=False, axis=None, level=None, try_cast=False, raise_on_error=True)

Series.dt.month The month as January=1, December=12

Series.autocorr(lag=1)

Series.swaplevel(i=-2, j=-1, copy=True)

Series.as_blocks(copy=True)

Series.nsmallest(*args, **kwargs)

Series.__iter__()