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Add example: is not operator

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Satwik Kansal 2017-08-29 01:22:52 +05:30
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@ -676,6 +676,19 @@ Yes, it runs for exactly 8 times and stops.
* It runs 8 times because that's the point at which the dictionary resizes to hold more keys (we have 8 deletion entries so a resize is needed). This is actually an implementation detail.
* Refer to this StackOverflow [thread](https://stackoverflow.com/questions/44763802/bug-in-python-dict) explaining a similar example.
## `is not ...` is different from `is (not ...)`
```py
>>> 'something' is not None
True
>>> 'something' is (not None)
False
```
### Explaination
- `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.
## Minor ones