"Edit with IDLE" is not working for .py files inside importlib package. during debugging, I cant go to source line, only for importlib package

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i want to edit the python files. but whenever i right click, everything disappear. that is the first problem i am facing. second problem is whenever I want to debug the code related to this package, i cant navigat through the source lines though IDLE debugger is showing the line and line numbers only inside debugger.