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Update link and add parenthesis to chained operators section

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jeffreykennethli 2022-06-03 10:15:21 -04:00
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@ -384,15 +384,15 @@ False
#### 💡 Explanation:
As per https://docs.python.org/3/reference/expressions.html#membership-test-operations
As per https://docs.python.org/3/reference/expressions.html#comparisons
> Formally, if a, b, c, ..., y, z are expressions and op1, op2, ..., opN are comparison operators, then a op1 b op2 c ... y opN z is equivalent to a op1 b and b op2 c and ... y opN z, except that each expression is evaluated at most once.
While such behavior might seem silly to you in the above examples, it's fantastic with stuff like `a == b == c` and `0 <= x <= 100`.
* `False is False is False` is equivalent to `(False is False) and (False is False)`
* `True is False == False` is equivalent to `True is False and False == False` and since the first part of the statement (`True is False`) evaluates to `False`, the overall expression evaluates to `False`.
* `1 > 0 < 1` is equivalent to `1 > 0 and 0 < 1` which evaluates to `True`.
* `True is False == False` is equivalent to `(True is False) and (False == False)` and since the first part of the statement (`True is False`) evaluates to `False`, the overall expression evaluates to `False`.
* `1 > 0 < 1` is equivalent to `(1 > 0) and (0 < 1)` which evaluates to `True`.
* The expression `(1 > 0) < 1` is equivalent to `True < 1` and
```py
>>> int(True)