How do you get the logical xor of two variables in Python?

For example, I have two variables that I expect to be strings. I want to test that only one of them contains a True value (is not None or the empty string):

```
str1 = raw_input("Enter string one:")
str2 = raw_input("Enter string two:")
if logical_xor(str1, str2):
print "ok"
else:
print "bad"
```

The `^`

operator seems to be bitwise, and not defined on all objects:

```
>>> 1 ^ 1
0
>>> 2 ^ 1
3
>>> "abc" ^ ""
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for ^: 'str' and 'str'
```

If you're already normalizing the inputs to booleans, then != is xor.

```
bool(a) != bool(b)
```

You can always use the definition of xor to compute it from other logical operations:

```
(a and not b) or (not a and b)
```

But this is a little too verbose for me, and isn't particularly clear at first glance. Another way to do it is:

```
bool(a) ^ bool(b)
```

The xor operator on two booleans is logical xor (unlike on ints, where it's bitwise). Which makes sense, since `bool`

is just a subclass of `int`

, but is implemented to only have the values `0`

and `1`

. And logical xor is equivalent to bitwise xor when the domain is restricted to `0`

and `1`

.

So the `logical_xor`

function would be implemented like:

```
def logical_xor(str1, str2):
return bool(str1) ^ bool(str2)
```

Credit to Nick Coghlan on the Python-3000 mailing list.

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