What’s the usage of the tilde operator in Python? One thing I can think about is do something in both sides of a string or list, such as check if a string is palindromic or not: def is_palindromic(s): return all(s[i] == s[~i] for i in range(len(s) / 2)) Any other good usage? 8 Answers 8
What does this line of code mean? label.frame = (inPseudoEditMode) ? kLabelIndentedRect : kLabelRect; The ? and : confuse me. 13 Answers 13
I’m currently programming a vocabulary algorithm that checks if a user has typed in the word correctly. I have the following situation: The correct solution for the word would be “part1, part2”. The user should be able to enter either “part1” (answer 1), “part2” (answer 2) or “part1, part2” (answer 3). I now try to … Read more
Observations: Java has a logical AND operator. Java has a logical OR operator. Java has a logical NOT operator. Problem: Java has no logical XOR operator, according to sun. I would like to define one. Method Definition: As a method it is simply defined as follows: public static boolean logicalXOR(boolean x, boolean y) { return … Read more
What is the Ruby <=> (spaceship) operator? Is the operator implemented by any other languages? 6 Answers 6
According to this, !==! is the not-equal string operator. Trying it, I get: C:\> if “asdf” !==! “fdas” echo asdf !==! was unexpected at this time. What am I doing wrong? 6 Answers 6
What happens (behind the curtains) when this is executed? int x = 7; x = x++; That is, when a variable is post incremented and assigned to itself in one statement? I compiled and executed this. x is still 7 even after the entire statement. In my book, it says that x is incremented! 18 … Read more
I have a pandas Series object containing boolean values. How can I get a series containing the logical NOT of each value? For example, consider a series containing: True True True False The series I’d like to get would contain: False False False True This seems like it should be reasonably simple, but apparently I’ve … Read more
This question already has answers here: Closed 10 years ago. What is the ‘instanceof’ operator used for? I learned that Java has the instanceof operator. Can you elaborate where it is used and what are its advantages? 4 Answers 4
What function does the ^ (caret) operator serve in Java? When I try this: int a = 5^n; …it gives me: for n = 5, returns 0 for n = 4, returns 1 for n = 6, returns 3 …so I guess it doesn’t perform exponentiation. But what is it then? 19 Answers 19
