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Why can't I iterate twice over the same iterator? How can I "reset" the iterator or reuse the data?（5个答案）
三年前关闭了。
我是Python新手，在创建Pandas数据框时遇到了麻烦。

dataDict = {}
dataDict['grant_id'] = grant_ids
dataDict['patent_title'] = patent_title
dataDict['kind'] = kinds

df=pd.DataFrame(dataDict)

上面的代码在python2中可以工作，但是当我切换到python3时，我得到了错误消息：

TypeError Traceback (most recent call last)
<ipython-input-6-3a9900bc5bca> in <module>()
      9 #dataDict['abstract'] = abstractResult
     10 
---> 11 df=pd.DataFrame(dataDict)
     12 
     13 df.head()

3 frames
/usr/local/lib/python3.6/dist-packages/pandas/core/internals/construction.py in extract_index(data)
    303             elif is_list_like(val) and getattr(val, 'ndim', 1) == 1:
    304                 have_raw_arrays = True
--> 305                 raw_lengths.append(len(val))
    306 
    307         if not indexes and not raw_lengths:

TypeError: object of type 'map' has no len()

grant_ids is a list of integers.

有办法补救吗？