Swapping 1 with 0 and 0 with 1 in a Pythonic way

Question

In some part of my Python program I have a val variable that can be 1 or 0. If it\'s 1 I must change to 0, if it\'s 0 I must change to 1.

How do you do it in a Pytho

Answer 1

The most pythonic way would probably be

int(not val)

But a shorter way would be

-~-val

Answer 2

To expand upon the answer by "YOU", use:

int(not(val))

Examples:

>>> val = 0
>>> int(not(val))
1
>>> val = 1
>>> int(not(val))
0

Note that this answer is only meant to be descriptive, not prescriptive.

Answer 3

Here's a simple way:

val = val + 1 - val * 2

For Example:

If val is 0

0+1-0*2=1

If val is 1

1+1-1*2=0

Answer 4

Function with mutable argument. Calling the swaper() will return different value every time.

def swaper(x=[1]):
    x[0] ^= 1
    return x[0]

Answer 5

(0,1)[not val] flips the val from 0 to 1 and vice versa.

Answer 6

Your way works well!

What about:

val = abs(val - 1)

short and simple!