What does "~" do to an int in python?

Asked Apr 19 '22 at 06:49

Active Apr 19 '22 at 06:49

Viewed 33 times

trying to negate a boolean mask I've come across this behavior: ~1 gives -2, ~0 gives -1. I somewhat remember this pattern from my System Programming class. Has it something to do with the two's or one's complement?

Thanks, I was able to negate it, I'm just curious about what this does.

asked Apr 19 '22 at 06:49

Olli

1

it's exactly two complement, as integers don't have a 16/32/64 whatever size in python – Jean-François Fabre Apr 19 '22 at 06:50
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check `bitwise operator` https://www.w3schools.com/python/gloss_python_bitwise_operators.asp – Epsi95 Apr 19 '22 at 06:50
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https://docs.python.org/3/reference/expressions.html#unary-arithmetic-and-bitwise-operations – Nick Apr 19 '22 at 06:52
@Jean-FrançoisFabre ah, I see, thanks a lot, I used a converter online and it didn't give the same answer as the two's complement and I wasn't sure. – Olli Apr 19 '22 at 06:52
@Epsi95 Thank you! – Olli Apr 19 '22 at 06:52

What does "~" do to an int in python?

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