CODEWITHSUNDEEP
pythonpython-3.x
Guimoute
Guimoute

Reputation: 4629

Flip a boolean value without referencing it twice

I am looking for a short syntax that would look somewhat like x *= -1 where x is a number, but for booleans, if it even exists. It should behave like b = not(b). The interested of this is being able to flip a boolean in a single line when the variable name is very long.

For example, if you have a program where you can turn on|off lamps in a house, you want to avoid writing the full thing:

self.lamps_dict["kitchen"][1] = not self.lamps_dict["kitchen"][1]

Upvotes: 5

Views: 1241

Answers (1)

sahinakkaya
sahinakkaya

Reputation: 6056

You can use xor operator (^):

x = True
x ^= True
print(x) # False
x ^= True
print(x) # True

Edit: As suggested by Guimoute in the comments, you can even shorten this by using x ^= 1 but it will change the type of x to an integer which might not be what you are looking for, although it will work without any problem where you use it as a condition directly, if x: or while x: etc.

Upvotes: 13

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