pandas.Series.str.isdigit — pandas 1.3.5 documentation
pandas.pydata.org › pandaspandas.Series.str.isdigit. ¶. Check whether all characters in each string are digits. This is equivalent to running the Python string method str.isdigit () for each element of the Series/Index. If a string has zero characters, False is returned for that check. Series or Index of boolean values with the same length as the original Series/Index.
pandas.Series.str.extract — pandas 1.3.5 documentation
pandas.pydata.org › pandasAny capture group names in regular expression pat will be used for column names; otherwise capture group numbers will be used. The dtype of each result column is always object, even when no match is found. If expand=False and pat has only one capture group, then return a Series (if subject is a Series) or Index (if subject is an Index).