KeyError Traceback (most recent call last) Cell In[54], line 1 ----> 1 groupk1 = df.groupby('key2').mean() 2 print(groupk1) File ~\AppData\Roaming\Python\Python310\site-packages\pandas\core\frame.py:8252, in DataFrame.groupby(self, by, axis, level, as_index, sort, group_keys, observed, dropna) 8249 raise TypeError("You have to supply one of 'by' and 'level'") 8250 axis = self._get_axis_number(axis) -> 8252 return DataFrameGroupBy( 8253 obj=self, 8254 keys=by, 8255 axis=axis, 8256 level=level, 8257 as_index=as_index, 8258 sort=sort, 8259 group_keys=group_keys, 8260 observed=observed, 8261 dropna=dropna, 8262 ) File ~\AppData\Roaming\Python\Python310\site-packages\pandas\core\groupby\groupby.py:931, in GroupBy.__init__(self, obj, keys, axis, level, grouper, exclusions, selection, as_index, sort, group_keys, observed, dropna) 928 self.dropna = dropna 930 if grouper is None: --> 931 grouper, exclusions, obj = get_grouper( 932 obj, 933 keys, 934 axis=axis, 935 level=level, 936 sort=sort, 937 observed=observed, 938 dropna=self.dropna, 939 ) 941 self.obj = obj 942 self.axis = obj._get_axis_number(axis) File ~\AppData\Roaming\Python\Python310\site-packages\pandas\core\groupby\grouper.py:985, in get_grouper(obj, key, axis, level, sort, observed, validate, dropna) 983 in_axis, level, gpr = False, gpr, None 984 else: --> 985 raise KeyError(gpr) 986 elif isinstance(gpr, Grouper) and gpr.key is not None: 987 # Add key to exclusions 988 exclusions.add(gpr.key) KeyError: 'key2'怎么解决

这是一个KeyError错误，意味着你试图访问一个不存在的键。在这种情况下，它是 'key2'。为了解决这个问题，你需要检查你的 DataFrame 中是否有一个名为 'key2' 的列。如果没有，请确保你正确地指定了该列的名称。如果你确定 DataFrame 中有 'key2' 这列，那么可能是大小写或者拼写错误导致的问题，你需要检查一下拼写是否正确，或者尝试使用 DataFrame.columns 检查列名。