英语中表达并列，and前加不加逗号？ - 知乎
Mar 22, 2016 · 这个用在and和or前面、有三者及以上并列时的逗号叫做 serial comma，或者series comma、 Oxford comma 、 Harvard comma。 基本原则 简单来说，加不加这个逗号，主要 …
What is Python's equivalent of && (logical-and) in an if-statement?
Mar 21, 2010 · There is no bitwise negation in Python (just the bitwise inverse operator ~ - but that is not equivalent to not). See also 6.6. Unary arithmetic and bitwise/binary operations and …
Which equals operator (== vs ===) should be used in JavaScript ...
Dec 11, 2008 · I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing …
java - && (AND) and || (OR) in IF statements - Stack Overflow
Java has 5 different boolean compare operators: &, &&, |, ||, ^ & and && are "and" operators, | and || "or" operators, ^ is "xor" The single ones will check every parameter, regardless of the …
How to use "and" and "or" in a "Where" clause - Stack Overflow
Jul 23, 2012 · I have a query that is gathering information based on a set of conditions. Basically I want to know if a location has paid out more than $50 for the day OR the comment section has …
What is the difference between the | and || or operators?
I have always used || (two pipes) in OR expressions, both in C# and PHP. Occasionally I see a single pipe used: |. What is the difference between those two usages? Are there any caveats …
css selectors - CSS "and" and "or" - Stack Overflow
May 9, 2010 · If we want to look for a div that contains both this AND that in their value attribute, we can simply connect both conditions, like so: div[value*="this"][value*="that"] In case we …
An "and" operator for an "if" statement in Bash - Stack Overflow
-a has duplicity. When used with the Bourne shell style test command, a.k.a. [, the it means and. When used as a conditional expression then it is testing to see if a file exists. Yes it is …
Difference between & and && in C? - Stack Overflow
Apr 3, 2018 · The & operator performs a bit-wise and operation on its integer operands, producing an integer result. Thus (8 & 4) is (0b00001000 bitand 0b00000100) (using a binary notation …
Difference between := and = operators in Go - Stack Overflow
May 5, 2020 · What is the difference between the = and := operators, and what are the use cases for them? They both seem to be for an assignment?