Quick Answer: How Does A While Loop Work In Python?

How do you use a while loop in Python?

With the while loop we can execute a set of statements as long as a condition is true.Print i as long as i is less than 6: i = 1.

while i < 6: ...

Exit the loop when i is 3: i = 1.

while i < 6: ...

Continue to the next iteration if i is 3: i = 0.

while i < 6: ...

Print a message once the condition is false: i = 1.

while i < 6:.

How does a while loop work?

Overview. The while construct consists of a block of code and a condition/expression. … This repeats until the condition/expression becomes false. Because the while loop checks the condition/expression before the block is executed, the control structure is often also known as a pre-test loop.

How does the for loop work in Python?

for loops are traditionally used when you have a block of code which you want to repeat a fixed number of times. The Python for statement iterates over the members of a sequence in order, executing the block each time.

Where do we use while loop?

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.

What is for loop while loop and do while loop?

A do.. while loop is almost the same as a while loop except that the loop body is guaranteed to execute at least once. A while loop says “Loop while the condition is true, and execute this block of code”, a do.. while loop says “Execute this block of code, and then continue to loop while the condition is true”.

What are the 3 types of loops?

Visual Basic has three main types of loops: for.. next loops, do loops and while loops.

How does a while loop start?

The while statement creates a loop that is executed while a specified condition is true. The loop will continue to run as long as the condition is true. It will only stop when the condition becomes false. … do/while – loops through a block of code once, and then repeats the loop while a specified condition is true.

What is Loop example?

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.

What are the 3 parts of a for loop?

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.

What does a for loop do?

In computer science, a for-loop (or simply for loop) is a control flow statement for specifying iteration, which allows code to be executed repeatedly. … For-loops are typically used when the number of iterations is known before entering the loop.

How do you end a loop in Python?

The break statement in Python terminates the current loop and resumes execution at the next statement, just like the traditional break found in C. The most common use for break is when some external condition is triggered requiring a hasty exit from a loop. The break statement can be used in both while and for loops.

What is for loop and while loop in Python?

In Python, “for loops” are called iterators. Just like while loop, “For Loop” is also used to repeat the program. But unlike while loop which depends on condition true or false. … For Loop iterates with number declared in the range.

Can we use while loop inside for loop in Python?

4. Nested for Loops Python. You can also nest a loop inside another. You can put a for loop inside a while, or a while inside a for, or a for inside a for, or a while inside a while.

What are the four elements of a while loop in Python?

Loop statements usually have four components: initialization (usually of a loop control variable), continuation test on whether to do another iteration, an update step, and a loop body.

What is the difference between for and while loop in Python?

Usage in Python While loops, like the ForLoop, are used for repeating sections of code – but unlike a for loop, the while loop will not run n times, but until a defined condition is no longer met. If the condition is initially false, the loop body will not be executed at all.

Which loop is faster in Python?

Use intrinsic operations. An implied loop in map() is faster than an explicit for loop; a while loop with an explicit loop counter is even slower. Avoid calling functions written in Python in your inner loop.

What is difference between while loop and do while loop?

do-while loop is similar to while loop, however there is a difference between them: In while loop, condition is evaluated first and then the statements inside loop body gets executed, on the other hand in do-while loop, statements inside do-while gets executed first and then the condition is evaluated.

Can you convert a for loop to a while loop?

You can always convert a for loop to a while loop. You can always convert a while loop to a for loop. … The elements inside the for loop control are separated using semicolons instead of commas. You can always convert a switch statement to an equivalent if statement.