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.tip

· one of the small things

breakpoint() drops you into the debugger where the bug is

It's one builtin call with no import, and PYTHONBREAKPOINT=0 turns every one of them off in production.

def apply_discount(order):
    breakpoint()
    ...

From there you can inspect locals, step through, and evaluate expressions against the live state. If ipdb is installed, set PYTHONBREAKPOINT=ipdb.set_trace for a nicer debugger.

pythondebugging