I was doing a leetcode question while I had the following python code:

```
pairs = [(1, 3)]
addend = 3
sum = 4
if ((addend, sum - addend) or (sum - addend, addend)) in pairs:
print("Pair exists")
```

The expected output when I ran this code should be

```
Pair exists
```

**But instead this prints nothing**, which I assume means `((addend, sum - addend) or (sum - addend, addend))`

evaluates to `False`

.

Then I removed the outer parentheses and made it

```
if (addend, sum - addend) or (sum - addend, addend) in pairs:
print("Pair exists")
```

This gave me the right output.

My second guess was this pair of redundant parentheses actually calculates `((addend, sum - addend) or (sum - addend, addend))`

, so I put `((1, 3) or (3, 1))`

in the Python3.7 console directly and that's the output

```
>>> ((1, 3) or (3, 1))
(1, 3)
```

But still this won't make sense since (1, 3) is indeed in pairs.

Could anybody explain why putting these parentheses invalidates the statement?