ValueError                                Traceback (most recent call last)
<ipython-input-27-7085cf325d4c> in <module>
      1 arr = ['foo', 'bar']
      2 data = pd.Series(data=arr)
----> 3 CountVectorizer(data).fit(data)

~/.conda/envs/ds36/lib/python3.6/site-packages/sklearn/feature_extraction/text.py in fit(self, raw_documents, y)
   1022         self
   1023         """
-> 1024         self.fit_transform(raw_documents)
   1025         return self
   1026

~/.conda/envs/ds36/lib/python3.6/site-packages/sklearn/feature_extraction/text.py in fit_transform(self, raw_documents, y)
   1056
   1057         vocabulary, X = self._count_vocab(raw_documents,
-> 1058                                           self.fixed_vocabulary_)
   1059
   1060         if self.binary:

~/.conda/envs/ds36/lib/python3.6/site-packages/sklearn/feature_extraction/text.py in _count_vocab(self, raw_documents, fixed_vocab)
    968         for doc in raw_documents:
    969             feature_counter = {}
--> 970             for feature in analyze(doc):
    971                 try:
    972                     feature_idx = vocabulary[feature]

~/.conda/envs/ds36/lib/python3.6/site-packages/sklearn/feature_extraction/text.py in <lambda>(doc)
    350                                                tokenize)
    351             return lambda doc: self._word_ngrams(
--> 352                 tokenize(preprocess(self.decode(doc))), stop_words)
    353
    354         else:

~/.conda/envs/ds36/lib/python3.6/site-packages/sklearn/feature_extraction/text.py in decode(self, doc)
    130             The string to decode
    131         """
--> 132         if self.input == 'filename':
    133             with open(doc, 'rb') as fh:
    134                 doc = fh.read()

~/.conda/envs/ds36/lib/python3.6/site-packages/pandas/core/generic.py in __nonzero__(self)
   1553             "The truth value of a {0} is ambiguous. "
   1554             "Use a.empty, a.bool(), a.item(), a.any() or a.all().".format(
-> 1555                 self.__class__.__name__
   1556             )
   1557         )

ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().