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Extend the explanation of the "is not ..." section 

I thought that the explanation for "'something' is (not None)" could
be a little more explicit.
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Lars Kellogg-Stedman 2020-01-19 10:13:50 -05:00
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@ -933,7 +933,7 @@ False
#### 💡 Explanation
- `is not` is a single binary operator, and has behavior different than using `is` and `not` separated.
- `is not` evaluates to `False` if the variables on either side of the operator point to the same object and `True` otherwise.
- `is not` evaluates to `False` if the variables on either side of the operator point to the same object and `True` otherwise. In this expression, `(not None)` evaluates to `True`, since `None` is is `False` in a boolean context, so the expression becomes `'something' is True`.
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