Turn a traceback into a fix
Walk through reading a Python traceback and making the smallest reliable fix.
stepper before-after panel marigold trap callout A ValueError occurs when converting quantity text to an integer. Read last line -> inspect value -> trace caller -> fix boundary Changing the crash line without inspecting the value can hide bad input. Name input Read the exception type and message at the bottom. This prevents the code from pretending every value is already clean. Choose shape Print or inspect the exact raw quantity value. The right Python structure makes the next operation obvious. Transform visibly Move validation to the parser where the raw string first appears. Small named steps beat one dense…
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