NaN
Acronym for “not a number”. The error message appears when the return of a code is not a number when a number is supposed to be returned.
| Error Message |
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|---|---|
| Bug example ✘ | Source of error: Only a number, not a list of numbers, can multiply by 4 directly.
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| Correction ✔ | Solution: Multiply each item in the list by 4 in a For loop. 
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