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I saw this declaration in Python, but I don't understand what it means and can't find an explanation:

ret, thresh = cv2.threshold(imgray, 127, 255, 0)

The question is: why is there there a comma between ret and thresh? What type of assignment is that?

That's a "tuple" or "destructuring" assignment - see e.g. Multiple assignment semantics. cv2.threshold returns a tuple containing two values, so it's equivalent to:

temp = cv2.threshold(...)
ret = temp[0]
thresh = temp[1]

See Assignment Statements in the language reference:

If the target list is a comma-separated list of targets: The object must be an iterable with the same number of items as there are targets in the target list, and the items are assigned, from left to right, to the corresponding targets.

C++ Declare Multiple Variables, Declare Many Variables. To declare more than one variable of the same type, use a comma-separated list: Example. int x = 5, y = 6, z = 50; cout << x + y + z;. Python allow you to declare and initialize more than one variable at the time. The syntax is simple but it has some details which are important. You can declare variables without type in Python and you can use them before declaration. Every variable in Python is an object.

This is a value unpacking syntax. cv2.threshold(imgray,127,255,0) returns a two element tuple. With this syntax you assign elements of this tuple to separate variables ret and thresh.

Declaring Multiple Variables in JavaScript, The first way is easier to maintain. Each declaration is a single statement on a single line, so you can easily add, remove, and reorder the  Multiple variable declaration. Multiple variables can be declared using a single statement. var name1, name2 type = initialvalue1, initialvalue2 is the syntax for multiple variable declaration. package main import "fmt" func main() { var width, height int = 100, 50 //declaring multiple variables fmt.Println("width is", width, "height is", height) } Run in playground

You can use this syntax to unpack tuples to single variables, e. g.:

a, b = (0, 1)
# a == 0
# b == 1

Your code is the same as:

result = cv2.threshold(...)
ret = result[0]
thresh = result[1]

DCL04-C. Do not declare more than one variable per , Declaring multiple variables in a single declaration can cause confusion regarding the types of the variables and their initial values. If more than one variable is  In VBA one can declare more than one variables with a single Dim statement as written below: Dim VAR1, VAR2, VAR3 As Integer. From the above way of declaration, usually we think that all the above 3 variables are declared as “Integer” Type. But this is NOT correct.

How to declare multiple variables in one statement in Javascript , getElementById("test").innerHTML = name + " " + userName + " " + age; </script> </body> </html>. Variables declaration can span into multiple lines also: <! As others have mentioned, from C++17 onwards you can make use of structured bindings for multiple variable assignments. Combining this with std::array and template argument deduction we can write a function that assigns a value to an arbitrary number of variables without repeating the type or value.

ES6 method of declaration multiple variables in , ES6 method of declaration multiple variables in one line. Using Javascript's ES6 or node, you can do the following: <!DOCTYPE html> <html> <body> <div  Regarding feature of SQL Server where multiple variable can be declared in one statement, it is absolutely possible to do. Method 1: Multiple statements for declaring multiple variables. DECLARE @Var1 INT DECLARE @Var2 INT SET @Var1 = 1 SET @Var2 = 2 SELECT @Var1 'Var1', @Var2 'Var2' GO. Method 2: Single statements for declaring multiple variables

SQL SERVER, Method 1: Multiple statements for declaring multiple variables. DECLARE @Var1 INT DECLARE @Var2 INT SET @Var1 = 1. SET @Var2 = 2 You can declare several variables in one statement. To specify a data type, you must include the data type for each variable. In the following statement, the variables intX , intY , and intZ are declared as type Integer .