Sep 10, 2023 · Operator precedence. But there is still something in Python which can mislead you: The result of and and or operators may be different from True or False - see 6.11 Boolean operations in the same document.

Jul 26, 2010 · Regardless of operator precedence the expression j * (j / m) is algebraically identical to (j * j) / m. Unfortunately, Python algebra is only an approximation of "Platonic ideal" algebra which could yield incorrect answers for either …

Aug 10, 2018 · I cannot produce example in Python which shows Boolean operator precedence rules combined with short circuit evaluation. I can show operator precedence using: print(1 or 0 and 0) # Returns 1 because `or` is evaluated 2nd. But the issue with short circuiting shows up when I change it to this:

Aug 5, 2012 · The main problem is that python applies operator precedence while parsing code. At that early point it is not possible for python to know what types the objects are actually involved in the expression (as the code has not been executed yet).

May 29, 2013 · Even that AND has a higher precedence, function isn't invoked at all, because the short-circuiting can happen on "foo". In math operations, short-circuiting doesn't happen, nothing can be skipped, so swapping logical operators to math operators doesn't help I guess. –

I came across a very nasty example of the if - else operator in Python where the code looked good but the result was completely different than expected. Here is a short version: 1 + 4 if None else 3 # returns 3 Looking at the Operator Precedence table in the documentation, it seems that if - else has almost the lowest precedence.

Feb 17, 2019 · In python, I am unable to understand the operator precedence. a = set([1, 2, 3]) a|set([4])-set([2]) The above expression returns {1,2,3,4}.

Mar 7, 2016 · I read about python following PEMDAS that is precedence of multiply is more than division. I ran the following script. print 6*2/1*2 Thus python should interpret this like 12/2 i.e 6 , since precedence of multiplication is more than division. But, the answer is 24. Could anyone let me know where the problem is? Thanks!

Oct 11, 2011 · According to the Python 2.4 reference manual not and comparisons have a different precedence. Then in the Python 2.7 reference manual not and comparisons have the same precedence. If i'm not mistaken not a < b < c will have varying results depending on the version of python.

Sep 10, 2019 · The right hand side: 4 if False else 3, 2 is evaluated first, and can be visualized as ((4 if False else 3), 2), which is an implicit tuple (a tuple without (), but a tuple nonetheless), and will eventually be 3, 2 or 4, 2 (depending on the evaluation of the if condition), then, the assignments will be made depending on what's on the left hand side, so, since there's only …