python - 破折号回溯不会导致我的代码中的任何行

Question

我正在开发我的第一个 Dash 应用程序。我收到以下错误：

"Cannot set a frame with no defined index "

问题是回溯不会导致我的代码中的任何行。它只通过已安装的库：

Traceback (most recent call last):
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\frame.py", line 3540, in _ensure_valid_index
    value = Series(value)
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\series.py", line 316, in __init__
    data = SingleBlockManager(data, index, fastpath=True)
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\internals\managers.py", line 1516, in __init__
    block = make_block(block, placement=slice(0, len(axis)), ndim=1)
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\internals\blocks.py", line 3284, in make_block
    return klass(values, ndim=ndim, placement=placement)
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\internals\blocks.py", line 2792, in __init__
    super().__init__(values, ndim=ndim, placement=placement)
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\internals\blocks.py", line 128, in __init__
    "{mgr}".format(val=len(self.values), mgr=len(self.mgr_locs))
ValueError: Wrong number of items passed 3, placement implies 0

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\LIAG8802\Documents\Procurement_analytics\venv\lib\site-packages\pandas\core\frame.py", line 3543, in _ensure_valid_index
    "Cannot set a frame with no defined index "
ValueError: Cannot set a frame with no defined index and a value that cannot be converted to a Series

我如何知道代码中的哪一行导致了错误？请注意，我发现了问题所在，但我想知道如何更轻松地追踪它。

编辑：请注意，我无法跟踪将 s 放在多行的问题，因为错误会在调试控制台中print弹出，而不是在不会崩溃的控制台中dashanaconda

标签： pythonpandasplotly-dash