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Python peeps: any idea why this attribute changes value when I re-examine it? I am using PyCharm, but the calculation is weird even in Jupyter.
It doesn’t just seem to be the debugger, running it in Jupyter gives the wrong value (just {'x'}, instead of {'x', 'y'}). The type appears to be a dictionary object as an attribute of a class, but the field is acting strange.
The error is triggered here.
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