Another common operation is the use of boolean vectors to filter the data. The operators are: | for or, & for and, and ~ for not. These must be grouped by using parentheses, since by default Python will evaluate an expression such as df.A > 2 & df.B < 3 as df.A > (2 & df.B) < 3, while the desired evaluation order is (df.A > 2) & (df.B < 3).

Sep 19, 2012 · Also like arithmetic operators, logical operators have precedence that determines how things are grouped in the absence of parentheses. In an expression, the operator with the highest precedence is grouped with its operand(s) first, then the next highest operator will be grouped with its operands, and so on.

From wikipedia on boolean logic: In such cases [of ambiguity], parentheses may be used to clarify the order of operations. As always, the operations within the innermost pair is performed first, followed by the next pair out, etc., until all operations within parentheses have been completed.

@flow2k The reason is that bitwise or has higher precedence than the comparison operators (that doesn't happen with the boolean or). For more information, please have a look at the documentation – jcollado

can anyone recommend software (preferably for mac) or a web based tool, that can be used to evaluate logic expressions? For example I would like to be able to quickly test whether two expressions like:

Sep 10, 2023 · 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. Share Improve this answer

Jan 27, 2016 · In pandas, I'd like to create a computed column that's a boolean operation on two other columns. In pandas, it's easy to add together two numerical columns. I'd like to do something similar with logical operator AND. Here's my first try:

Nov 30, 2009 · When we work with boolean logic, we are like the mother: we know the operators ahead of time, and we want to work with the statement in that form. Perhaps we want to transform the statement into a different form (as was the original question, he or she wanted to know if two statements are equivalent).

Jun 22, 2018 · I've been thinking about this some more - it's an interesting question - and I came to the conclusion that having a lossy transformation for certain values might not be enough reason that there is no reverse operator.

I have a list of booleans in python. I want to AND (or OR or NOT) them and get the result. The following code works but is not very pythonic.