[Python] Can't run a Python file in PyCham: why?

I can't run a Python file in PyCham: why?

The run icon is greyed out:



I went to Run → Edit Configurations… to make sure the correct Python interpreter is selected. Debug, coverage, and profile are fine but I don't see run:



Strangely, only run won't run. What's the issue? I use PyCharm 2024.2.3 Pro.

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