This is impossible to do with Python's range. But this can be accomplished by creating your own generator function.
def myRange(start,end,step):
i = start
while i < end:
yield i
i += step
yield end
for i in myRange(0,99,20):
print(i)
Output:
0
20
40
60
80
99
W3Schools
w3schools.com › python › python_for_loops.asp
Python For Loops
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).
W3Schools
w3schools.com › python › gloss_python_for_range.asp
Python Looping Through a Range
Python Examples Python Compiler ... Glossary · 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 ...
Videos
W3Schools
w3schools.com › python › gloss_python_for_continue.asp
Python Continue For Loop
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... With the continue statement we can stop the current iteration of the loop, and continue with the next: ... fruits = ["apple", "banana", "cherry"] for x in fruits: if x == "banana": continue print(x) Try it Yourself »
Snakify
snakify.org › for loop with range
For loop with range - Learn Python 3 - Snakify
To iterate over a decreasing sequence, we can use an extended form of range() with three arguments - range(start_value, end_value, step). When omitted, the step is implicitly equal to 1. However, can be any non-zero value. The loop always includes start_value and excludes end_value during iteration:
W3Schools
w3schools.com › python › python_sets_loop.asp
Python - Loop Sets
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training · ❮ Previous Next ❯ · You can loop through the set items by using a for loop: Loop through the set, and print the values: thisset = {"apple", "banana", "cherry"} for x in thisset: print(x) Try it Yourself » ·
Real Python
realpython.com › python-range
Python range(): Represent Numerical Ranges – Real Python
November 24, 2024 - for i in range(5) is a loop that iterates over the numbers from 0 to 4, inclusive. The range parameters start, stop, and step define where the sequence begins, ends, and the interval between numbers.
Top answer 1 of 3
6
This is impossible to do with Python's range. But this can be accomplished by creating your own generator function.
def myRange(start,end,step):
i = start
while i < end:
yield i
i += step
yield end
for i in myRange(0,99,20):
print(i)
Output:
0
20
40
60
80
99
2 of 3
3
First of all, it usually does not makes much sense to include the end condition, the idea of a range is to perform hops until the end value is reached.
Nevertheless, you can for instance use itertools.chain for that:
from itertools import chain
for i in chain(range(0,99,20), [99]):
# ...
passchain concatenates iterables together. So after the range(..) is exhausted, it will iterate over the next iterable, and so on.
The above approach is not very elegant: it requires some knowledge about how chain works. We can however encapsulate that logic:
def range_with_end(start, stop, step):
return chain(range(start, stop, step), (stop,))Learn Python
learnpython.org › en › Loops
Loops - Learn Python - Free Interactive Python Tutorial
While loops repeat as long as a certain boolean condition is met. For example: # Prints out 0,1,2,3,4 count = 0 while count < 5: print(count) count += 1 # This is the same as count = count + 1 · break is used to exit a for loop or a while loop, whereas continue is used to skip the current block, and return to the "for" or "while" statement.
W3Schools
w3schools.com › python › python_lists_loop.asp
Python - Loop Lists
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... Learn more about for loops in our Python For Loops Chapter.
Top answer 1 of 3
8
Ideally one would use threading to accomplish this. You can do something like
import threading
interval = 15
def myPeriodicFunction():
print "This loops on a timer every %d seconds" % interval
def startTimer():
threading.Timer(interval, startTimer).start()
myPeriodicFunction()
then you can just call
startTimer()
in order to start the looping timer.
2 of 3
2
Consider tracking the time it takes the code to run (a timer() function), then sleeping for 15 - exec_time seconds after completion.
start = datetime.now()
do_many_important_things()
end = datetime.now()
exec_time = end - start
time.sleep(15-exec_time.total_seconds())
W3Schools
w3schools.com › python › python_challenges_for_loops.asp
Python For Loops Code Challenge
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... Test your understanding of Python for loops by completing a small coding challenge.
Python
wiki.python.org › moin › ForLoop
ForLoop - Python Wiki
When running the above example, you can stop the program by pressing ctrl+c at the same time. As you can see, these loop constructs serve different purposes. The for loop runs for a fixed amount of times, while the while loop runs until the loop condition changes.
Python
peps.python.org › pep-0284
PEP 284 – Integer for-loops | peps.python.org
March 1, 2002 - One of the most common uses of for-loops in Python is to iterate over an interval of integers. Python provides functions range() and xrange() to generate lists and iterators for such intervals, which work best for the most frequent case: half-open ...
DataCamp
datacamp.com › tutorial › loops-python-tutorial
Python Loops Tutorial: For & While Loop Examples | DataCamp
October 18, 2017 - Find a comprehensive tutorial for Python range loops, nested loops, and keywords. See For & While loops in action with Python now!
GeeksforGeeks
geeksforgeeks.org › python › loops-in-python
Loops in Python - GeeksforGeeks
The continue statement in Python returns the control to the beginning of the loop. ... for letter in 'geeksforgeeks': if letter == 'e' or letter == 's': continue print('Current Letter :', letter)
Published 2 weeks ago
W3Schools
w3schools.in › python › loops
Python Loops - W3Schools
Python supports three types of loop control statements: ... for letter in 'TutorialsCloud': if letter == 'C': pass print ('Pass block') print ('Current letter is:', letter)
Raspberry Pi Forums
forums.raspberrypi.com › board index › hardware and peripherals › raspberry pi pico › micropython
Executing the code in a loop at a fixed interval. - Raspberry Pi Forums
>>> paste mode; Ctrl-C to cancel, Ctrl-D to finish === import sys, time === import uos === === def something(_count): === time.sleep_ms(uos.urandom(1)[0] >> 2) === === _count = 0 === _interval = 100 === while True: === time.sleep_ms(_interval - int(time.ticks_ms() % _interval)) === print(time.ticks_ms()) === something(_count) === _count += 1 2471500 2471600 2471700 2471800 2471900 2472001 2472101 2472200 2472300 2472400 2472500
Real Python
realpython.com › python-for-loop
Python for Loops: The Pythonic Way – Real Python
February 23, 2026 - Learn how to use Python for loops to iterate over lists, tuples, strings, and dictionaries with Pythonic looping techniques.
W3Schools
w3schools.com › python › python_while_loops.asp
Python While Loops
Python Examples Python Compiler Python Exercises Python Quiz Python Challenges Python Server Python Syllabus Python Study Plan Python Interview Q&A Python Bootcamp Python Certificate Python Training ... With the while loop we can execute a set of statements as long as a condition is true. ... Note: remember to increment i, or else the loop will continue forever.
Reddit
reddit.com › r/learnpython › struggling to understand for loops in python
r/learnpython on Reddit: Struggling to understand for loops in Python
September 9, 2025 -
Hey everyone, I’m learning Python and I feel really stuck when it comes to for loops. I understand the basic syntax like:
for i in range(5):
print(i)But when I try to apply loops to real problems, I get confused. For example, looping through a list or using range with different start/stop/step values trips me up. Sometimes I don’t know when to use for item in list versus for i in range(len(list)).
It feels like I understand loops in isolation but not how to use them properly in practical code.
Can someone explain in a simple way how to think about for loops, and maybe give me some beginner-friendly challenges/exercises so I can practice the right way?
Thanks a lot!
Top answer 1 of 5
10
If we stay with the example of a list, think of it this way: Imagine you have a list with elements [a,b,c] And you need to loop through the list for some action The question then is, do you need the actual elements, for example because you want to validate them or something? In that case going with the actual element in "for i in list" is the way to go. However, if you need the indexes of the items, for example for comparing or checking where in an ordered list items are, going with "for i in range(len(list))" is the way to go, as it allows you to check the current element of the list with a simple "list[i]" while being able to do something with the index itself. Ideally very often you would use something more descriptive than "i" if you need to do a bigger operation with it in order to makeit clear to the reader of your code what the selected item/index is for Please excuse my poor code formatting, I am on mobile, but I hope this helped you a little.. TLDR: It depends on use case which way to use for loops
2 of 5
4
For the most part it's a matter of convenience and practicality. Let's say you have some kids in a line, and you want to say good morning to each one. Then you would just iterate over their names. But let's say that you also want to give a present to each one, and you need to give the first gift to the first kid, the second gift to the second kid, and so on... Then you can just use the number, and you'd use the same number both for the kids and the gifts. If you're cool you can use enumerate too.