Series.sem(axis=None, skipna=None, level=None, ddof=1, numeric_only=None, **kwargs)

Series.nunique(dropna=True)

Series.pow(other, level=None, fill_value=None, axis=0)

Series.data return the data pointer of the underlying data

Series.str.isalpha()

Series.isnull()

Series.str.partition(pat=' ', expand=True)

Series.str.lstrip(to_strip=None)

Series.order(na_last=None, ascending=True, kind='quicksort', na_position='last', inplace=False)

Series.dt.strftime(*args, **kwargs)