What is the purpose of while loop in Python?

The while loop is used to repeat a section of code an unknown number of times until a specific condition is met. For example, say we want to know how many times a given number can be divided by 2 before it is less than or equal to 1.

1. i = 3.
2. while True: Loop forever.
3. print(i)
4. i = i – 1.
5. if i == 0: Stop loop when `i` is `0`
6. break.

The loop initialization where we initialize our counter to a starting value. The initialization statement is executed before the loop begins. If the condition is true, then the code given inside the loop will be executed, otherwise the control will come out of the loop. …

The main difference between the two is the while loop may execute zero times if the condition is initially false, the repeat-until loop always executes at least once.

The == operator compares the value or equality of two objects, whereas the Python is operator checks whether two variables point to the same object in memory. In the vast majority of cases, this means you should use the equality operators == and !=

Loops are control structures used to repeat a given section of code a certain number of times or until a particular condition is met. Visual Basic has three main types of loops: for.. next loops, do loops and while loops.

Start the while loop by writing a do while command. The while command usually includes the words “do while,” along with other minimal code.

The For-EndFor Statement Structure Similar to a While loop, a For loop consists of three parts: the keyword For that starts the loop, the condition being tested, and the EndFor keyword that terminates the loop. JAWS performs all statements found in the boundaries of the loop as long as the loop condition is true.

A loop is used for executing a block of statements repeatedly until a particular condition is satisfied. For example, when you are displaying number from 1 to 100 you may want set the value of a variable to 1 and display it 100 times, increasing its value by 1 on each loop iteration.

After the body of the ‘for’ loop executes, the flow of control jumps back up to the increment statement. … If it is true, the loop executes and the process repeats itself (body of loop, then increment step, and then again condition). After the condition becomes false, the ‘for’ loop terminates.

for loop: for loop provides a concise way of writing the loop structure. Unlike a while loop, a for statement consumes the initialization, condition and increment/decrement in one line thereby providing a shorter, easy to debug structure of looping.

1. /* For loop */ int i; for(i = 0; i < 10; i++) { } …
2. /* While loop */ while(*str++ != NULL) { length++; …
3. /* Do while loop */ do. { status = check_connection(); …
4. /* For loop */ int i; for(i = 0; i < 10; i++) {

In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.

In Python != is defined as not equal to operator. It returns True if operands on either side are not equal to each other, and returns False if they are equal. … And is not operator returns True if operands on either side are not equal to each other, and returns false if they are equal.

The not-equal-to operator ( != ) returns true if the operands don’t have the same value; otherwise, it returns false .