Yelp Web抓取

Question

在Jupyter notebook上运行代码时，我遇到了这个错误。我安装了matplotlib和pandas。有人知道这会是什么吗？代码：

def average_words(x):
   words = x.split()
   return sum(len(word) for words in word) / len(words)
df['average_word_length'] = df['review'].apply(lambda x: average_words(x))
---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-102-bbc583af9f13> in <module>
----> 1 df['average_word_length'] = df['review'].apply(lambda x: average_words(x))

/opt/anaconda3/envs/py36/lib/python3.6/site-packages/pandas/core/series.py in apply(self, func, convert_dtype, args, **kwds)
   3846             else:
   3847                 values = self.astype(object).values
-> 3848                 mapped = lib.map_infer(values, f, convert=convert_dtype)
   3849 
   3850         if len(mapped) and isinstance(mapped[0], Series):

pandas/_libs/lib.pyx in pandas._libs.lib.map_infer()

<ipython-input-102-bbc583af9f13> in <lambda>(x)
----> 1 df['average_word_length'] = df['review'].apply(lambda x: average_words(x))

<ipython-input-96-4f4dfe065b11> in average_words(x)
      1 def average_words(x):
      2    words = x.split()
----> 3    return sum(len(word) for words in word) / len(words)

NameError: name 'word' is not defined

需要说明的是，我正在尝试从Yelp的网站上进行Web抓取

Answer 1

问题：

NameError:未定义名称'word‘。您正在尝试访问word，但word显然未定义。

可能的解决方案：

我认为正确的返回语句是这样的：

return sum(len(word) for word in words) / len(words)

(我在for word in words中切换了word和 words ，因为我假设words是数组，而不是word)