System Info

• param 1.9.3
• pytest 5.3.1
• Windows 8.1

My Pain

I’m developing a component based on Param and Panel and would like to test it with pytest. During development my tests stopped working/ running but without errors. After some debugging I discovered it was due to a stackoverflow that pytest did not report. It just stopped.

I’ve developed a smaller code example below. I’ve also included the stack trace.

Stack Trace

$ python 'test_issue_multple_param_action.py'
Fatal Python error: Cannot recover from stack overflow.

Current thread 0x00001be8 (most recent call first):
  File "C:\Users\masma\source\repos\orsteddcsmarketsanalytics\api\.venv\lib\site-packages\param\parameterized.py", line 1535 in get_param_values
  File "C:\Users\masma\source\repos\orsteddcsmarketsanalytics\api\.venv\lib\site-packages\param\parameterized.py", line 2408 in __repr__
  File "C:\Users\masma\source\repos\orsteddcsmarketsanalytics\api\.venv\lib\site-packages\param\parameterized.py", line 2408 in <listcomp>

..........

  File "C:\Users\masma\source\repos\orsteddcsmarketsanalytics\api\.venv\lib\site-packages\param\parameterized.py", line 2408 in <listcomp>
  File "C:\Users\masma\source\repos\orsteddcsmarketsanalytics\api\.venv\lib\site-packages\param\parameterized.py", line 2408 in __repr__
  ...
(.venv)

Code

import param

class InputDataComponent(param.Parameterized):
    update_data = param.Action()
    download_data = param.Action()

    def __init__(self, **params):
        super().__init__(**params)

        self.update_data = self._update_data
        self.download_data = self._download_data

    def _update_data(self, event):
        raise NotImplementedError()

    def _download_data(self, event):
        raise NotImplementedError()

repr(InputDataComponent())