我有以下数据：
index Simulation no# Line Load Wind1 Wind2 Wind3 flag Sequence
0 12 7.0 Line 16 - 19 0.7 0.0 0.0 0.0 1.0 [('G 05', 'Over-Speed', '1.70')]
1 38 20.0 Line 01 - 02 0.7 0.0 0.0 0.0 1.0 [('G 01', 'Under-Speed', '5.00')]
2 60 31.0 Line 01 - 39 0.7 0.0 0.0 0.0 1.0 [('G 02', 'UV', '2.73'), ('G 01', 'Under-Speed...
3 80 41.0 Line 16 - 19 0.7 0.0 0.0 0.2 1.0 [('G 05', 'Over-Speed', '1.72')]
最后一列是对象类型。我希望提取这些条目中的最后一个字符串，它实际上是一个时间值。因此，例如，在我的第一行中，该条目是： [（'G 05'，'Over-Speed'，'1.70'）]，我想提取'1.70'。为了说明我的问题，我做了以下工作：
test = df['Sequence'][0:1]
test
12 [('G 05', 'Over-Speed', '1.70')]
Name: Sequence, dtype: object
通过在“超速”上进行分割，我应该能够在任一侧获取字符串，但是当我执行以下命令时，我会得到随后的错误。
test.str.split('Over-Speed')[1]
---------------------------------------------------------------------------
KeyError Traceback (most recent call last)
<ipython-input-205-8a3c145d0c99> in <module>
----> 1 test.str.split('Over-Speed')[1]
~/anaconda3/lib/python3.7/site-packages/pandas/core/series.py in __getitem__(self, key)
869 key = com.apply_if_callable(key, self)
870 try:
--> 871 result = self.index.get_value(self, key)
872
873 if not is_scalar(result):
~/anaconda3/lib/python3.7/site-packages/pandas/core/indexes/base.py in get_value(self, series, key)
4403 k = self._convert_scalar_indexer(k, kind="getitem")
4404 try:
-> 4405 return self._engine.get_value(s, k, tz=getattr(series.dtype, "tz", None))
4406 except KeyError as e1:
4407 if len(self) > 0 and (self.holds_integer() or self.is_boolean()):
pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_value()
pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_value()
pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()
pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()
pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.Int64HashTable.get_item()
KeyError: 1
有人可以帮助我了解这里出了什么问题吗？