Traceback (most recent call last):

  File "<ipython-input-14-11afbb328a0b>", line 1, in <module>
    runfile('C:/Users/Josh/untitled0.py', wdir='C:/Users/Josh')

  File "C:\Users\Josh\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 710, in runfile
    execfile(filename, namespace)

  File "C:\Users\Josh\Anaconda3\lib\site-packages\spyder\utils\site\sitecustomize.py", line 101, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/Josh/untitled0.py", line 9, in <module>
    df['y'] = df.eval('@around(x,1)')

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\frame.py", line 2186, in eval
    return _eval(expr, inplace=inplace, **kwargs)

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\computation\eval.py", line 267, in eval
    ret = eng_inst.evaluate()

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\computation\engines.py", line 75, in evaluate
    res = self._evaluate()

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\computation\engines.py", line 121, in _evaluate
    _check_ne_builtin_clash(self.expr)

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\computation\engines.py", line 31, in _check_ne_builtin_clash
    names = expr.names

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\computation\expr.py", line 750, in names
    return frozenset([self.terms.name])

  File "C:\Users\Josh\Anaconda3\lib\site-packages\pandas\core\generic.py", line 879, in __hash__
    ' hashed'.format(self.__class__.__name__))

TypeError: 'Series' objects are mutable, thus they cannot be hashed