Python comparison weirdness

Question

I have an object that I need to compare some attributes of and I can't explain what is going on, but the following is the output of my VS code debugger (I added '=' before each output)

(0 > 55000 | 150 > 280)
=False # expected
250>150
=True # expected
True & False 
=False # expected
(250>150 & (0 > 55000 | 150 > 280))
=True # what????

(If you're used to NumPy and Pandas using `|` and `&`, that's because `or` and `and` are non-overloadable due to short circuiting issues.) — user2357112, Sep 26 '21 at 05:10

score 2 · Accepted Answer · edited Sep 30 '21 at 17:27

2

For numbers, & is "bitwise and" and | is "bitwise or". These operators have higher precedence than comparison operators like > and <.

150 & (0 > 55000 | 150 > 280) == 150 & 0 == 0 then 150>0 is True.

edited Sep 30 '21 at 17:27

DanGoodrick

2,410
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answered Sep 26 '21 at 05:11

Yu Cheng

91
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score 0 · Answer 2 · answered Sep 26 '21 at 05:13

0

You're using binary bitwise operators & and |. You should be using boolean operators and and or.

answered Sep 26 '21 at 05:13

Yuri Sh

569
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score 0 · Answer 3 · answered Sep 26 '21 at 05:18

0

| and & are bit operators. bit operators have higher priority better than comparison operator. you should change '|' to "or"and '&' to "and"

answered Sep 26 '21 at 05:18

heroes of cheese

11

Python comparison weirdness

3 Answers3