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Scottan merged 1 commit into from
May 6, 2026
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Update 04-defensive_programming.md #108

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2 changes: 1 addition & 1 deletion episodes/04-defensive_programming.md
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Expand Up @@ -256,7 +256,7 @@ check_sign(val)
```

```output
Value: nan is a number.
Value: nan is negative.
```

However numpy does provide the `isnan()` function for testing if a value is NaN. Add an assertion test using this which will raise and error if the value is NaN.
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