How to disable automatic variable evaluation when debugging?

File | Settings | Build, Execution, Deployment | Debugger | Data Views > disable Enable auto expressions in Variables view

Thank you.

You're welcome!

I changed the setting but it's still calling the `__str__` method. What should I expect to see?

I find that even with this option turned off, the debugger will still evaluate all the attributes of an object (everything decorated with '@property'). This is a problem because I have properties that are expensive to evaluate and do not allow me to carry out proper debugging. Am I misunderstanding this option?

@Tom Edwards

Can you provide example? Does it perhaps help to change variable loading policy to 'on demand'? 

Andrey Resler

Here is an example:

class Thing:
    y = 1
    
    @property
    def x(self):
        print("ACCESSING Thing.x")
        return 2

thing = Thing()
pass

If you set a breakpoint at the last line then run the debugger, what will happen is that as soon as you expand the `thing` object in the Variables pane, it will evaluate all the attributes of `thing`. 

I tried changing the variable loading policy to 'on demand' but that made no difference. 

@ Tom Edwards

Thank you for the example. Unfortunately yes, in this example the code inside the x function will be executed and there's no easy way to suppress that. I think this is worthy of a ticket so here we go: https://youtrack.jetbrains.com/issue/PY-39729

Andrey Resler

Thanks for submitting the ticket! 

Thank you Andrey Resler! (and @... for making the ticket).   A design mistake I made 14 years ago on my "music21" package (which I didn't fully understand properties) gives some properties bad side-effects -- I wish I could change them to methods, but there's too much usage of the package to make a change like that now.

https://github.com/cuthbertLab/music21/issues/536 

Thanks!