Python - Loops
| Sr.No. | Loop Type & Description |
| 1 | while loop Repeats a statement or group ... |
| 2 | for loop Executes a sequence of statemen ... |
| 3 | nested loops You can use one or more loo ... |
How many types of loops are there in Python?
Python programming language provides following types of loops to handle looping requirements. Python provides three ways for executing the loops. While all the ways provide similar basic functionality, they differ in their syntax and condition checking time.
How do you loop through a set of numbers in Python?
The range() Function To loop through a set of code a specified number of times, we can use the range() function, The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.
How to break out of multiple loops in Python?
In this article, we will see how to break out of multiple loops in Python. For example, we are given a list of lists arr and an integer x. The task is to iterate through each nested list in order and keep displaying the elements until an element equal to x is found.
What is Python looping?
Python - Loops. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.
What are the 3 types of loops in Python?
Loop Typeswhile loop.for loop.nested loops.
What are the 4 types of loops?
Types of Loops in CSr. No.Loop Type1.While Loop2.Do-While Loop3.For LoopJun 4, 2022
What are the 3 loops?
Visual Basic has three main types of loops: for.. next loops, do loops and while loops.
How many loops are there?
There are two main types of loops, for loops and while loops.
What is loop in Python?
The for loop in Python is used to iterate over a sequence (list, tuple, string) or other iterable objects. Iterating over a sequence is called traversal.
Which is not a Python loop?
A while not loop in Python repeatedly executes the loop's body until the condition for loop termination is met. Use the syntax while not condition with the condition as a boolean expression to execute the loop's body if the condition evaluates to False.
How many loops are there in C++?
3 typesThere are 3 types of loops in C++. This tutorial focuses on C++ for loop. We will learn about the other type of loops in the upcoming tutorials.
What is a loop and list its types?
Two major types of loops are FOR LOOPS and WHILE LOOPS. A For loop will run a preset number of times whereas a While loop will run a variable number of times. TYPE OF LOOP — FOR LOOP. For loops are used when you know how many times you want to run an algorithm before stopping.
Introduction to Loops in Python
In programming, the loops are the constructs that repeatedly execute a piece of code based on the conditions. These are useful in many situations like going through every element of a list, doing an operation on a range of values, etc.
While Loop in Python
While loops execute a set of lines of code iteratively till a condition is satisfied. Once the condition results in False, it stops execution, and the part of the program after the loop starts executing.
Python For loop
For loop in Python works on a sequence of values. For each value in the sequence, it executes the loop till it reaches the end of the sequence. The syntax for the for loop is:
Python Nested Loops
We can also have a loop in another loop and like this, we can have multiple loops nested one in another. The syntax to nest while and for loops is :
Python Loop Control Statements
There are three loop control statements in Python that modify the flow of iteration. These are :
Conclusion
In this article, we learned about loops in Python. We saw for and while loops in detail and then the nested loops. We also discussed the control statements.
Python For Loops
A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).
The break Statement
With the break statement we can stop the loop before it has looped through all the items:
The continue Statement
With the continue statement we can stop the current iteration of the loop, and continue with the next:
The range () Function
The range () function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.
Else in For Loop
The else keyword in a for loop specifies a block of code to be executed when the loop is finished:
The pass Statement
for loops cannot be empty, but if you for some reason have a for loop with no content, put in the pass statement to avoid getting an error.
How are Python loops executed?
Python - Loops. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on. There may be a situation when you need to execute a block of code several number of times.
What is a while loop?
1. while loop. Repeats a statement or group of statements while a given condition is TRUE. It tests the condition before executing the loop body. 2. for loop. Executes a sequence of statements multiple times and abbreviates the code that manages the loop variable. 3. nested loops.
What is a break statement in Python?
1. break statement. Terminates the loop statement and transfers execution to the statement immediately following the loop. 2. continue statement. Causes the loop to skip the remainder of its body and immediately retest its condition prior to reiterating. 3. pass statement. The pass statement in Python is used when a statement is required ...
What is a while loop?
2. while loop statement: In while loop condition, the block of code execute over and over again until the condition is True. If condition gets False it doesn’t execute the block.
What is the if statement in Python?
if and else statement. 1. If statement: In Python, if condition is used to verify whether the condition is true or not. If condition is true execute the body part or block of code. If false doesn’t execute the body part or block of code.
What is a while loop?
The while loop, on the other hand, executes the block of code and keeps on repeating that block until an event happens. Loops combined with if, if-else, and else-if test condition results make programming very efficient and elegant.
How many friends did Michael invite to his 8th birthday?
Michael ran into this situation when he celebrated his 8 th birthday. He invited his 30 friends, who brought gifts. Michael decided to send ‘Thank you’ notes to his 30 friends. After he wrote about five ‘Thank you notes’, it got very boring.
Can the same code be executed multiple times?
There are situations where the same block of code needs to be executed repeatedly many times. Most programmers run into this situation, where the same task needs to be done repeatedly several times.
What happens if an inner loop completes without breaking?
On the other hand, if the inner loop completes without encountering any break statement then the else block containing the continue statement will be executed and the outer loop will continue to run. The idea is the same even if the number of loops increases.
What happens when an inner loop terminates?
If the inner loop terminates due to a break statement given inside the inner loop, then the else block after the inner loop will not be executed and the break statement after the else block will terminate the outer loop also. On the other hand, if the inner loop completes without encountering any break statement then the else block containing ...
What does an if block do in an outer loop?
The outer loop must contain an if block after the inner loop. The if block must check the value of the flag variable and contain a break statement. If the flag variable is True, then the if block will be executed and will break out of the inner loop also. Else, the outer loop will continue.