我有下面的值。我想排序每行这是时间升序方式为2023-02-24，然后2023-02-25。
我尝试使用我的代码获得结果，但它生成了如下错误。

df['request_time_list']

//Result looks as below
0     2023-02-25,2023-02-24
1     2023-02-25,2023-02-24
2     2023-02-24,2023-02-25
3     2023-02-24,2023-02-25
4     2023-02-24,2023-02-25
5     2023-02-24,2023-02-25
6     2023-02-25,2023-02-24
7     2023-02-24,2023-02-25
8     2023-02-25,2023-02-24
9     2023-02-25,2023-02-24
10    2023-02-24,2023-02-25



df['request_time_list'].apply(lambda x: ','.join(sorted(x.split(','))))


Fail to execute line 6: df['request_time_list'].apply(lambda x: ','.join(sorted(x.split(','))))
Traceback (most recent call last):
  File "/tmp/zeppelin_pyspark-6146174346709974932.py", line 380, in <module>
    exec(code, _zcUserQueryNameSpace)
  File "<stdin>", line 6, in <module>
  File "/usr/local/lib/python3.7/dist-packages/pandas/core/series.py", line 4357, in apply
    return SeriesApply(self, func, convert_dtype, args, kwargs).apply()
  File "/usr/local/lib/python3.7/dist-packages/pandas/core/apply.py", line 1043, in apply
    return self.apply_standard()
  File "/usr/local/lib/python3.7/dist-packages/pandas/core/apply.py", line 1101, in apply_standard
    convert=self.convert_dtype,
  File "pandas/_libs/lib.pyx", line 2859, in pandas._libs.lib.map_infer
  File "<stdin>", line 6, in <lambda>
  File "/usr/local/lib/python3.7/dist-packages/pandas/util/_decorators.py", line 311, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/pandas/core/frame.py", line 6242, in sort_values
    keys = [self._get_label_or_level_values(x, axis=axis) for x in by]
  File "/usr/local/lib/python3.7/dist-packages/pandas/core/frame.py", line 6242, in <listcomp>
    keys = [self._get_label_or_level_values(x, axis=axis) for x in by]
  File "/usr/local/lib/python3.7/dist-packages/pandas/core/generic.py", line 1779, in _get_label_or_level_values
    raise KeyError(key)
KeyError: '2023-02-25'

如何实现我的问题？
谢谢。