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 shortest approach is using the bitwise operator XOR.

If you want val to be reassigned:

val ^= 1

If you do not want val to be reassigned:

val ^ 1

Answer 2

Since True == 1 and False == 0 in python,

you could just use var = not var

It will just swap it.

Answer 3

In your case I recommend the ternary:

val = 0 if val else 1

If you had 2 variables to swap you could say:

(a, b) = (b, a)

Answer 4

use np.where

ex.

np.where(np.array(val)==0,1,0)

this gives 1 where val is 0 and gives 0 where val is anything else, in your case 1

EDIT: val has to be array