Python Pandas 错误

Posted 2023-03-11

【中文标题】Python Pandas 错误

【英文标题】：Python Pandas error

【发布时间】：2017-11-16 16:44:25

【问题描述】：

首先，大家好。我目前正在做一个项目，我的主要目标是从 csv 文件中获取一些地址，计算这些地址与可信数据库的相似性百分比并返回该值。 我有一个可以工作的代码，但是，当我尝试计算相似的速率时，“写入 csv”函数出现错误。代码只运行一行，然后就崩溃了。错误在第 30 行之后开始发生。提前感谢您的帮助，祝您有美好的一天。

完整代码：https://pastebin.com/4sJZJtY9

错误：

Traceback (most recent call last):
  File "C:\anaconda\lib\site-packages\pandas\core\indexes\base.py", line 2393, in get_loc
    return self._engine.get_loc(key)
  File "pandas\_libs\index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc (pandas\_libs\index.c:5239)
  File "pandas\_libs\index.pyx", line 154, in pandas._libs.index.IndexEngine.get_loc (pandas\_libs\index.c:5085)
  File "pandas\_libs\hashtable_class_helper.pxi", line 1207, in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas\_libs\hashtable.c:20405)
  File "pandas\_libs\hashtable_class_helper.pxi", line 1215, in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas\_libs\hashtable.c:20359)
KeyError: 1

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File ".\Teste.py", line 74, in <module>
    cp4[1].to_csv('AI.csv')
  File "C:\anaconda\lib\site-packages\pandas\core\frame.py", line 2062, in __getitem__
    return self._getitem_column(key)
  File "C:\anaconda\lib\site-packages\pandas\core\frame.py", line 2069, in _getitem_column
    return self._get_item_cache(key)
  File "C:\anaconda\lib\site-packages\pandas\core\generic.py", line 1534, in _get_item_cache
    values = self._data.get(item)
  File "C:\anaconda\lib\site-packages\pandas\core\internals.py", line 3590, in get
    loc = self.items.get_loc(item)
  File "C:\anaconda\lib\site-packages\pandas\core\indexes\base.py", line 2395, in get_loc
    return self._engine.get_loc(self._maybe_cast_indexer(key))
  File "pandas\_libs\index.pyx", line 132, in pandas._libs.index.IndexEngine.get_loc (pandas\_libs\index.c:5239)
  File "pandas\_libs\index.pyx", line 154, in pandas._libs.index.IndexEngine.get_loc (pandas\_libs\index.c:5085)
  File "pandas\_libs\hashtable_class_helper.pxi", line 1207, in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas\_libs\hashtable.c:20405)
  File "pandas\_libs\hashtable_class_helper.pxi", line 1215, in pandas._libs.hashtable.PyObjectHashTable.get_item (pandas\_libs\hashtable.c:20359)
KeyError: 1

【问题讨论】：

第 29 行是注释......我不认为错误存在

【参考方案1】：

您正在尝试访问 cp4[1]，看起来 cp4 是像字典一样的对象并且没有键 1。无论如何，这有点奇怪。当您迭代 cp4 时，您正在尝试访问 cp4[1]。请考虑一下。

【参考方案2】：

似乎错误发生在to_csv 方法调用之前：cp4 没有密钥1。

你读过回溯吗？它明确指出问题出在第 74 行：

File ".\Teste.py", line 74, in <module>
    cp4[1].to_csv('AI.csv')