This is also why I find debugging with print and assert statements to be much more helpful than single stepping, in the vast majority of cases. Single stepping was more useful to me when I didn't necessarily understand all the language constructs. That was 20-25 years ago, though.
Nowadays, if I have some weird bug, it's because something I think is true is not, or some other "invisible-to-me" error. A judiciously placed print statement (perhaps guarded by an 'if' to filter out the noise) makes it easy for me to prove or disprove my assumptions about what's happening in the code, though, without disrupting any of the code around it. I can compare working cases to non-working cases easily and in a batch-wise manner after the fact. Very useful.
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