Method isin

pandas/core/series.py:6002–6079

Whether elements in Series are contained in `values`. Return a boolean Series showing whether each element in the Series matches an element in the passed sequence of `values` exactly. Parameters ---------- values : set or list-like The s

(self, values)

        return v

    def isin(self, values) -> Series:
        """
        Whether elements in Series are contained in `values`.

        Return a boolean Series showing whether each element in the Series
        matches an element in the passed sequence of `values` exactly.

        Parameters
        ----------
        values : set or list-like
            The sequence of values to test. Passing in a single string will
            raise a ``TypeError``. Instead, turn a single string into a
            list of one element.

        Returns
        -------
        Series
            Series of booleans indicating if each element is in values.

        Raises
        ------
        TypeError
          * If `values` is a string

        See Also
        --------
        DataFrame.isin : Equivalent method on DataFrame.

        Examples
        --------
        >>> s = pd.Series(
        ...     ["llama", "cow", "llama", "beetle", "llama", "hippo"], name="animal"
        ... )
        >>> s.isin(["cow", "llama"])
        0     True
        1     True
        2     True
        3    False
        4     True
        5    False
        Name: animal, dtype: bool

        To invert the boolean values, use the ``~`` operator:

        >>> ~s.isin(["cow", "llama"])
        0    False
        1    False
        2    False
        3     True
        4    False
        5     True
        Name: animal, dtype: bool

        Passing a single string as ``s.isin('llama')`` will raise an error. Use
        a list of one element instead:

        >>> s.isin(["llama"])
        0     True