AttributeError: 'list' object has no attribute 'isdigit'

Question

我想在 pandas 中提取 POS。我做的如下

import pandas as pd
from nltk.tag import pos_tag
df = pd.DataFrame({'pos': ['noun', 'Alice', 'good', 'well', 'city']})
s = df['pos']
tagged_sent = pos_tag(s.str.split())

但得到回溯：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "../lib/python2.7/site-packages/nltk/tag/__init__.py", line 111, in pos_tag
    return _pos_tag(tokens, tagset, tagger)
  File "../lib/python2.7/site-packages/nltk/tag/__init__.py", line 82, in _pos_tag
    tagged_tokens = tagger.tag(tokens)
  File "/Users/mjpieters/Development/venvs/Whosebug-2.7/lib/python2.7/site-packages/nltk/tag/perceptron.py", line 152, in tag
    context = self.START + [self.normalize(w) for w in tokens] + self.END
  File "../lib/python2.7/site-packages/nltk/tag/perceptron.py", line 224, in normalize
    elif word.isdigit() and len(word) == 4:
AttributeError: 'list' object has no attribute 'isdigit'

怎么了？

Answer 1

表达式 s.str.split() 是字符串的 list，而不是字符串（pos_tag 所期望的）。因为 isdigit 是 str 的方法。

Answer 2

你实际上可以将 Series 对象直接传递给 pos_tag() 方法：

s = df['pos']
tagged_sent = pos_tag(s)  # or pos_tag(s.tolist())
print(tagged_sent)

打印：

[('noun', 'JJ'), ('Alice', 'NNP'), ('good', 'JJ'), ('well', 'RB'), ('city', 'NN')]

AttributeError: 'list' object has no attribute 'isdigit'

AttributeError: 'list' object has no attribute 'isdigit'

python

nltk

pos-tagger