python short circuit assignment

. These two add together to form a statement. So I'm going to give an assignment operation, what is an assignment, or a reference to this in a variable. For example:As you can see here, I first assign a value of 1 to Num. And what does this + = mean? Put num this number 1 plus 1, then will come out of the result is, the meaning of the. What does it equal. Assign the variable num = 3 directlyIn a logical ope

with some data for the current time:LocalTime ([seconds]), (TM_YEAR,TM_MON,TM_DAY,TM_HOUR,TM_MIN,TM_SEC,TM_WDAY,TM_YDAY,TM_ISDST)Then is the if inference inside the OR and and.Not in Python's logical operator! " (non), (with), | | (or) ".These three notation symbols (all in English). That is not,and,or.But look at the source code. Infer whether a leap year should be:1. Suppose to be divisible by 400 that's a leap year2. Suppose to be divisible by 4 and not divisible by 100That if inference shou

circuit mechanism in Python: def a(): print 'this is A!' return 1def b(): print 'this is B!' return 1def c(): print 'this is C!' return 1if a() or b() and not c(): print 'OK!' If the priority of and is higher than or, shouldn't B be followed by C and then A? How can I output A directly? In fact, this is also the case in other languages, but I didn't care about it at the time. This is

Core IdeasThe expression is left-to-right, and if the left logical value of OR is True, then all expressions (whether and or or) that are short-circuited or are directly output or left-hand expressions. The expression is left-to-right, and if the left logical value of and is False, then all the and expressions are shorted, until an or appears, and the output and left expression to the left of or is involved in the next logical operation. If the left o

Javascript optimization details: Short Circuit expressions and javascript expressions What is short circuit expression? Short-circuit expression: Used as the operand expressions of the "" and "|" operators. When evaluating these e

I. Short Circuit Logic Short-circuit logic is also called lazy evaluation. It has an interesting feature in well-known Boolean operations: the value is evaluated only when the value is required. For example, conditiona () and conditionb () are true when both conditions are true. Therefore, if conditiona () is false, t

, the core idea of its operational rules is the short circuit logic. Expressions are evaluated from left to right, and if the left logical value of OR is true, then all expressions (whether and or or, directly output or left-hand expressions) after or are shorted. The expression is computed from left to right, and if the left logical value of and is false, then all and expressions are shorted,

) ; // TenBut the value of the reference type is passed, only the reference address is passed, so one of the values is changed, and the other one changes. It was like a room with two keys, one opening the door, taking all the money, and the other key opening the door, the money was gone.var a=[1,2,3,4]; var b=A;a.pop (); Console.log (b); // the3. function declaration in advanceAll Var-declared variables and function-declared functions are centrally declared at the top of the current scope

" | grep-V '2017. 0.0.1 '| cut-D: -F2 | cut-d "" F1 // The combination of grep and cut uses 8. The display/etc/sysconfig/network-scripts/ifcfg-eth0 file contains decimal numbers similar to IP address points formatted rows; grep-e "([0-9] {1, 3 }\.) {3 }\. [0-9] {1, 3} "/etc/sysconfig/network-scripts/ifcfg-eth0Grep "[0-9] \ {1, 3 \}\. "\ {3 \}\. [0-9] \ {1, 3 \}/etc/sysconfig/network-scripts/ifcfg-eth0 // note the difference between egrep and grep--------------------------------------------------

My life is short. I use Python: A Brief History of development in a programming language Python is a simple, elegant, and easy-to-use language. Two days ago, I was excited about the benefits of Python to my friends. "Okay, I admit that Python is good, but why is it called

same time to determine the use of or (indicating that two conditions have a successful judgment condition), or and (indicates that only two conditions at the same time to establish a judgment condition is successful). So when judging a condition as multiple values , you can use the following form:Multiple conditions3) NoteThe Python composite Boolean expression evaluates to a short-

the name, such as directly with accounts.• Name to make a meaningful distinction, sometimes you may use the name of A1,A2, it is best not to do so, in a separate way, by literal to see a certain distinction to better.• The best name can be read out, do not make their own English words, also do not use what is written, especially in your country, but also like to use Hanyu Pinyin abbreviation as the name, more trouble, than the whole fight it. It is best to use a complete word or a recognized ab

, and dialogue with different concrete things.Sending the same message to different classes of objects will have different behavior. For example, if your boss lets all employees start working at nine o'clock, he says "get started" at nine o'clock, instead of saying to the salesperson: "Start a sales job," say to the technician, "Start technical work", because "employee" is an abstract thing, so long as the employee can start to work, He knows that. As for each employee, of course, they do their