def isin(self, values):
result = algorithms.isin(self, values)<EOL>return self._constructor(result, index=self.index).__finalize__(self)<EOL>
Check whether `values` are contained in Series.

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.

    .. versionadded:: 0.18.1

      Support for values as a set.

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(['lama', 'cow', 'lama', 'beetle', 'lama',
...                'hippo'], name='animal')
>>> s.isin(['cow', 'lama'])
0     True
1     True
2     True
3    False
4     True
5    False
Name: animal, dtype: bool

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

>>> s.isin(['lama'])
0     True
1    False
2     True
3    False
4     True
5    False
Name: animal, dtype: bool