LearnPython.com
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8 Python while Loop Examples for Beginners | LearnPython.com
February 5, 2024 - Let’s go over a simple Python while loop example to understand its structure and functionality: >>> i = 0 >>> while i < 5: >>> print(i) >>> i += 1 ... The condition in this while loop example is that the variable i must be less than 5. The ...
Berkeley
pythonnumericalmethods.studentorg.berkeley.edu › notebooks › chapter05.02-While-Loops.html
While Loops — Python Numerical Methods
Python computes n >= 1 or 0.5 >= 1, which is false so the while-loop ends with i = 4. You may have asked, “What if the logical expression is true and never changes?” and this is indeed a very good question. If the logical expression is true, and nothing in the while-loop code changes the expression, then the result is known as an infinite loop. Infinite loops run forever, or until your computer breaks or runs out of memory. EXAMPLE...
Need help understanding this while loop
I’m new to while loops, and I don’t quite get what’s going on in this code from my book: current_number = 1 while current_number More on discuss.python.org
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February 13, 2024python - for or while loop to do something n times - Stack Overflow
In Python you have two fine ways to repeat some action more than once. One of them is while loop and the other - for loop. So let's have a look on two simple pieces of code: ... My question is which of them is better. Of course, the first one, which is very common in documentation examples and ... More on stackoverflow.com
[python] For loops vs while loops
Why would somebody use a loop construct when there is goto? Why would somebody use a high-level language when there is assembly language? Why would somebody name their variables when they can just use the memory addresses?
Answer: Because writing code that intuitively "looks like" the thing it is intended to do, both a) makes writing programs much less work, b) dramatically reduces the number of bugs, and c) greatly decreases the difficulty of reading, understanding, and maintaining the code later.
We use for loops when we want to loop over a range, or loop over the elements of a set. This is a fixed operation over a known amount of steps. Essentially, we are saying something along the lines of "for each employee, calculate the salary and submit a payment", so we call it "for" to highlight this relationship. In the case of Python, for loops also provide a special efficient syntax for looping over the elements of a set, so it's less work to type the thing in too. Some other languages call that variant of the for statement "foreach".
We use while loops when we want to continue repeating an operation while a condition continues to hold. For example, we continue looping as long as we encounter no errors, or as long as we receive more data from a network connection. These are not fixed ranges, but take place while a condition holds, so we call it "while".
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August 26, 2013how to restart while loop in python
There's no commands to run inside of a loop to restart it. You need to organize things so that the loop will start again, probably by putting it in another loop. It's probably easier to organize inside a function, like this: def calculatorLoopThing(): for x in whatever: doMyLoopStuff() if userChoseRestart(): return RESTART return QUIT def main(): while True: if calculateLoopThing() == QUIT: break There are lots of ways to express it. More on reddit.com
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March 29, 2021Videos
W3Schools
w3schools.com › python › python_while_loops.asp
Python While Loops
The while loop requires relevant variables to be ready, in this example we need to define an indexing variable, i, which we set to 1.
Programiz
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Python while Loop (With Examples)
For example, while True: user_input = input("Enter password: ") # terminate the loop when user enters exit if user_input == 'exit': print(f'Status: Entry Rejected') break print(f'Status: Entry Allowed') ... Before we wrap up, let’s put your knowledge of Python while loop to the test!
Real Python
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Python while Loops: Repeating Tasks Conditionally – Real Python
March 3, 2025 - When you evaluate a list in a Boolean context, you get True if it contains elements and False if it’s empty. In this example, colors remains true as long as it has elements. Once you remove all the items with the .pop() method, colors becomes false, and the loop terminates. Getting user input from the command line is a common use case for while loops in Python.
Python documentation
docs.python.org › 3 › tutorial › controlflow.html
4. More Control Flow Tools — Python 3.14.3 documentation
For example (no pun intended): >>> # Measure some strings: >>> words = ['cat', 'window', 'defenestrate'] >>> for w in words: ... print(w, len(w)) ... cat 3 window 6 defenestrate 12 · Code that modifies a collection while iterating over that same collection can be tricky to get right. Instead, it is usually more straight-forward to loop over a copy of the collection or to create a new collection:
Python.org
discuss.python.org › python help
Need help understanding this while loop - Python Help - Discussions on Python.org
February 13, 2024 - I’m new to while loops, and I don’t quite get what’s going on in this code from my book: current_number = 1 while current_number <= 5: print(current_number) current_number += 1 After just watching a video on Yo…
freeCodeCamp
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Python Do While – Loop Example
August 31, 2021 - For example, when you're writing a program that takes in input from users you may ask for only a positive number. The code will run at least once. If the number the user submits is negative, the loop will keep on running.
Server Academy
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Python While Loop Tutorial - Server Academy
November 12, 2024 - This example uses the time.sleep() function to create a 1-second delay between each countdown number. The while loop is a versatile and powerful control structure in Python that can help you manage iterative tasks based on conditions.
DigitalOcean
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How To Construct While Loops in Python 3 | DigitalOcean
August 20, 2021 - When we run the program again with python guess.py, we see that the user gets more guided assistance in their guessing. So, if the randomly-generated number is 12 and the user guesses 18, they will be told that their guess is too high, and they can adjust their next guess accordingly. There is more that can be done to improve the code, including error handling for when the user does not input an integer, but in this example we see a while loop at work in a short command-line program.
GeeksforGeeks
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Python While Loop - GeeksforGeeks
When execution leaves a scope, all automatic objects that were created in that scope are destroyed. Python supports the following control statements. Python Continue Statement returns the control to the beginning of the loop. ... # Prints all letters except 'e' and 's' i = 0 a = 'geeksforgeeks' while i < len(a): if a[i] == 'e' or a[i] == 's': i += 1 continue print(a[i]) i += 1
Published December 23, 2025
Simplilearn
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Introduction to Python While Loop
May 27, 2024 - Python is an object-oriented programming language consisting of three types of loops. Learn about the Python While loop, break and continue statements, & more.
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DataCamp
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Emulating a Do-While Loop in Python: A Comprehensive Guide for Beginners | DataCamp
January 31, 2024 - To emulate a "do-while" loop in Python, you can use a while loop with a True condition and strategically place a break statement. Here's an example:
CodeHS
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Tutorial: While Loops in Python | CodeHS
Learn the basics of while loops in Python.
Stanford CS
cs.stanford.edu › people › nick › py › python-while.html
While Loop
We do this by writing the loop as while True:... Here is an example that uses while/True to go through the numbers 0..9. This not the best way to generate those numbers; it just shows how if/break can serve instead of a while/test at the top of the loop.
Mimo
mimo.org › glossary › python › while-loop
Master Python While Loops: A Comprehensive Guide
Master Python from basics to advanced topics, including data structures, functions, classes, and error handling ... Start your coding journey with Python. Learn basics, data types, control flow, and more ... condition: A boolean expression that the while loop evaluates before each iteration.
Quora
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How to use for and while loops in Python - Quora
Answer (1 of 10): > [[ Warning: this answer is for beginners and learners. . . . Proficient programmers need not read. ]] —— It’s day ten on planet Uiton. Jan and two colleagues set out in their spaceships, early in the morning, but by noon, something had hit Jan’s ship, causing it ...
IONOS
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How to use while loops in Python - IONOS
September 26, 2022 - For example, say you want to write code for the exchange of messages over an open connection. As long as the connection is up, messages will be processed. A Python if statement in the body of the loop will evaluate signals and potentially terminate ...
ScholarHat
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Loops in Python - For, While loop (With Examples)
September 10, 2025 - A nested loop in Python means using one loop inside another loop. It is commonly used when you need to repeat actions in a multi-level structure, like printing patterns or working with multi-dimensional lists (like 2D arrays). for iterating_var in sequence: for iterating_var in sequence: statements(s) statements(s) while expression: while expression: statement(s) statement(s)
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but on the other hand it creates a completely useless list of integers just to loop over them. Isn't it a waste of memory, especially as far as big numbers of iterations are concerned?
That is what xrange(n) is for. It avoids creating a list of numbers, and instead just provides an iterator object.
In Python 3, xrange() was renamed to range() - if you want a list, you have to specifically request it via list(range(n)).
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This is lighter weight than xrange (and the while loop) since it doesn't even need to create the int objects. It also works equally well in Python2 and Python3
from itertools import repeat
for i in repeat(None, 10):
do_sth()