Python Tutorial for Beginners: While Loops in Python

While Loops in Python | Python for Beginners

In this tutorial, we learn about While Loops in Python.

Python while loop is used to run a specific code until a certain condition is met.

Python While Loop is used to execute a block of statements repeatedly until a given condition is satisfied. And when the condition becomes false, the line immediately after the loop in the program is executed.

Code in GitHub: https://github.com/AlexTheAnalyst/PythonYouTubeSeries/blob/main/Python%20Basics%20101%20-%20While%20Loops.ipynb 

0:00 Intro
0:35 Syntax of While Loop
1:57 Break Statement in While Loop
2:44 Else Statement in While Loop
3:50 Continue Statement in While Loop
5:18 Outro

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Python while Loop

Python while loop is used to run a specific code until a certain condition is met.

The syntax of while loop is:

while condition:
    # body of while loop

Here,

1. A while loop evaluates the condition
2. If the condition evaluates to True, the code inside the while loop is executed.
3. condition is evaluated again.
4. This process continues until the condition is False.
5. When condition evaluates to False, the loop stops.

Flowchart for Python While Loop

Flowchart for while Loop in Python

Example: Python while Loop

# program to display numbers from 1 to 5

# initialize the variable
i = 1
n = 5

# while loop from i = 1 to 5
while i <= n:
    print(i)
    i = i + 1

Output

1
2
3
4
5

Here's how the program works:

Variable	Condition: i <= n	Action
i = 1 n = 5	True	1 is printed. i is increased to 2.
i = 2 n = 5	True	2 is printed. i is increased to 3.
i = 3 n = 5	True	3 is printed. i is increased to 4.
i = 4 n = 5	True	4 is printed. i is increased to 5.
i = 5 n = 5	True	5 is printed. i is increased to 6.
i = 6 n = 5	False	The loop is terminated.

Example 2: Python while Loop to Display Game Level

current_level = 0
final_level = 5

game_completed = True

while current_level <= final_level:
    if game_completed: 
        print('You have passed level', current_level)
        current_level += 1

print('Level Ends')

Output

You have passed level 0
You have passed level 1
You have passed level 2
You have passed level 3
You have passed level 4
You have passed level 5
Level Ends

In the above example, we have used the while loop to check the current level and display it on the console.

Infinite while Loop in Python

If the condition of a loop is always True, the loop runs for infinite times (until the memory is full). For example,

# infinite while loop
while True:
    # body of the loop

In the above example, the condition is always True. Hence, the loop body will run for infinite times.

Python While loop with else

A while loop can have an optional else block as well.

The else part is executed after the condition in the while loop evaluates to False. For example,

counter = 0

while counter < 3:
    print('Inside loop')
    counter = counter + 1
else:
    print('Inside else')

Output

Inside loop
Inside loop
Inside loop
Inside else

Here, we have used the counter variable to print the 'Inside Loop' string three times.

On the fourth iteration, the condition in while becomes False. Hence, the else part is executed.

Python for vs while loops

The for loop is usually used when the number of iterations is known. For example,

# this loop is iterated 4 times (0 to 3)
for i in range(4):
    print(i)

And while loop is usually used when the number of iterations are unknown. For example,

while condition:
    # body of loop

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How to Use If-Else Statements and Loops in R – Dataquest

When we’re programming in R (or any other language, for that matter), we often want to control when and how particular parts of our code are executed. We can do that using control structures like if-else statements, for loops, and while loops.

Control structures are blocks of code that determine how other sections of code are executed based on specified parameters. You can think of these as a bit like the instructions a parent might give a child before leaving the house:

“If I’m not home by 8pm, make yourself dinner.”

Control structures set a condition and tell R what to do when that condition is met or not met. And unlike some kids, R will always do what we tell it to! You can learn more about control structures in the R documentation if you would like.

In this tutorial, we assume you’re familiar with basic data structures, and arithmetic operations in R.

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Comparison Operators in R

In order to use control structures, we need to create statements that will turn out to be either TRUE or FALSE. In the kids example above, the statement “It’s 8pm. Are my parents home yet?” yields TRUE (“Yes”) or FALSE (“No”). In R, the most fundamental way to evaluate something as TRUE or FALSE is through comparison operators.

Below are six essential comparison operators for working with control structures in R:

• == means equality. The statement x == a framed as a question means “Does the value of x equal the value of a?”
• != means “not equal”. The statement x == b means “Does the value of x not equal the value of b?”
• < means “less than”. The statement x < c means “Is the value of x less than the value of c?”
• <= means “less than or equal”. The statement x <= d means “Is the value of x less or equal to the value of d?”
• > means “greater than”. The statement x > e means “Is the value of x greater than the value of e?”
• >= means “greater than or equal”. The statement x >= f means “Is the value of xgreater than or equal to the value of f?”

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While Loops in Python - Beginner Python Tutorial #9

Get started with Python!
In this Python tutorial, we will keep learning about repetition structures in Python.
You will understand how and when While Loops should be used. We will also cover the concept of infinite loop.
The break and continue statements will also be explained, they are used to control the execution flow of any repetition structure in Python.

For Loop Video: https://www.youtube.com/watch?v=XTisXBSH7kQ&feature=youtu.be

Playlist: Beginner Python Tutorials | Video #9
Access the code here: https://github.com/rscorrea1/youtube.git

Timestamp:
0:00 - Video summary
0:20 - While loop
6:54 - Infinite loop
8:29 - Break statement
9:57 - Continue statement

Thumbnail:
Photo by Mario Ho on Unsplash

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Learn Python - Full Course for Beginners [Tutorial]

This course will give you a full introduction into all of the core concepts in python. Follow along with the videos and you’ll be a python programmer in no time!
⭐️ Contents ⭐
⌨️ (0:00) Introduction
⌨️ (1:45) Installing Python & PyCharm
⌨️ (6:40) Setup & Hello World
⌨️ (10:23) Drawing a Shape
⌨️ (15:06) Variables & Data Types
⌨️ (27:03) Working With Strings
⌨️ (38:18) Working With Numbers
⌨️ (48:26) Getting Input From Users
⌨️ (52:37) Building a Basic Calculator
⌨️ (58:27) Mad Libs Game
⌨️ (1:03:10) Lists
⌨️ (1:10:44) List Functions
⌨️ (1:18:57) Tuples
⌨️ (1:24:15) Functions
⌨️ (1:34:11) Return Statement
⌨️ (1:40:06) If Statements
⌨️ (1:54:07) If Statements & Comparisons
⌨️ (2:00:37) Building a better Calculator
⌨️ (2:07:17) Dictionaries
⌨️ (2:14:13) While Loop
⌨️ (2:20:21) Building a Guessing Game
⌨️ (2:32:44) For Loops
⌨️ (2:41:20) Exponent Function
⌨️ (2:47:13) 2D Lists & Nested Loops
⌨️ (2:52:41) Building a Translator
⌨️ (3:00:18) Comments
⌨️ (3:04:17) Try / Except
⌨️ (3:12:41) Reading Files
⌨️ (3:21:26) Writing to Files
⌨️ (3:28:13) Modules & Pip
⌨️ (3:43:56) Classes & Objects
⌨️ (3:57:37) Building a Multiple Choice Quiz
⌨️ (4:08:28) Object Functions
⌨️ (4:12:37) Inheritance
⌨️ (4:20:43) Python Interpreter
📺 The video in this post was made by freeCodeCamp.org
The origin of the article: https://www.youtube.com/watch?v=rfscVS0vtbw&list=PLWKjhJtqVAblfum5WiQblKPwIbqYXkDoC&index=3

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Lambda, Map, Filter functions in python

Welcome to my Blog, In this article, we will learn python lambda function, Map function, and filter function.

Lambda function in python: Lambda is a one line anonymous function and lambda takes any number of arguments but can only have one expression and python lambda syntax is

Syntax: x = lambda arguments : expression

Now i will show you some python lambda function examples:

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For Loops in Python - Beginner Python Tutorial #8

Get started with Python!
In this Python tutorial, we will start learning about repetition structures in Python.
You will understand how and when For Loops should be used.
The break and continue statements will also be explained, they are used to control the execution flow of any repetition structure in Python.

Playlist: Beginner Python Tutorials | Video #8
Access the code here: https://github.com/rscorrea1/youtube.git

Timestamp:
00:00 - Video summary
00:26 - For Loops
04:40 - Break statement
06:37 - Continue statement
07:56 - Nested loops
09:33 - Exercise 1: nested loop + break
11:03 - Exercise 2: nested loop + continue statement
12:04 - Wrapping up

Thumbnail:
Photo by Mario Ho on Unsplash

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