How to read "not 4 > 2 and 2 < 3" in python?

Question

How to use "not" and "and" with comparison operators? I have never seen them before? I thought you only use "not" and "and" in a loop or under some if statements? Are there any more examples of this? What is this called?

Anyway why is not 4 > 2 and 2 < 3, false?

See https://docs.python.org/3/reference/expressions.html#boolean-operations and https://docs.python.org/3/reference/expressions.html#operator-precedence. — jonrsharpe, Nov 15 '21 at 08:54

score 0 · Answer 1 · answered Nov 15 '21 at 08:57

0

In short, it is down to Python operator precedence and the general rules of statement logic:

  (not 4 > 2) and 2 < 3
#      +++++ 
#      True 
# +++++++++++     +++++
#   False         True
# +++++++++++++++++++++
#         False

answered Nov 15 '21 at 08:57

user2390182

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I wouldn't say it's down to operator precedence, because there isn't an order of operations that would give true. – jonrsharpe Nov 15 '21 at 09:04
:P `(not 4 > 2 and 2) < 3` – user2390182 Nov 15 '21 at 09:05
good point, I was assuming at least consistent precedence! – jonrsharpe Nov 15 '21 at 09:08
This is of course a ridiculous reading, but statement is meant in general. The evaluation of such a logcial expression depends on those two aspects. – user2390182 Nov 15 '21 at 09:10

How to read "not 4 > 2 and 2 < 3" in python?

1 Answers1