If you're frequently iterating over a Cartesian product like in your example, you might want to investigate Python 2.6's itertools.product -- or write your own if you're in an earlier Python.
from itertools import product
for y, x in product(range(3), repeat=2):
do_something()
for y1, x1 in product(range(3), repeat=2):
do_something_else()
GeeksforGeeks
geeksforgeeks.org › python › python-nested-loops
Python Nested Loops - GeeksforGeeks
Inner loop runs from 1 to 10. Each inner loop iteration multiplies the outer loop value with the inner loop value. Example 3: Printing using different inner and outer nested loops
Published 4 days ago
Real Python
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Nested Loops in Python – Real Python
May 21, 2025 - Browse Topics Guided Learning Paths ... web-scraping ... Nested loops in Python allow you to place one loop inside another, enabling you to perform repeated actions over multiple sequences....
[Python] Can someone please explain to me how nested for loops work using this example. I don't understand how it works
What does this do? for j in range(i,userInput): print('*', end=' ') If you don't know, try it. Assign values to i and userInput manually and see if you can figure it out. More on reddit.com
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March 11, 2025In python is there an easier way to write 6 nested for loops? - Stack Overflow
This problem has been getting at me for a while now. Is there an easier way to write nested for loops in python? For example if my code went something like this: for y in range(3): for x in ... More on stackoverflow.com
Python Code for nested loops
Does anyone know how to print the following pattern using nested loops? 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5 More on discuss.python.org
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August 31, 2022How to continue in nested loops in Python - Stack Overflow
How can you continue the parent loop of say two nested loops in Python? for a in b: for c in d: for e in f: if somecondition: More on stackoverflow.com
Videos
W3Schools
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Python Nested 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 nested loop is a loop inside a loop.
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Python - Nested Loops
In Python, when you write one or more loops within a loop statement that is known as a nested loop. The main loop is considered as outer loop and loop(s) inside the outer loop are known as inner loops.
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Nested Loops in Python
September 2, 2021 - Nested loops are typically used for working with multidimensional data structures, such as printing two-dimensional arrays, iterating a list that contains a nested list. A nested loop is a part of a control flow statement that helps you to ...
Softuni
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Chapter 6.1. Nested Loops - Programming Basics with Python
Test your solution here: ... a rectangle made out of N x N asterisks. ... A nested loop is a construction where the body of one loop (the outer one) stays inside another loop (the inner one)....
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Python Nested Loops | Complete Guide To Nested Loops in Python
May 10, 2024 - It would be good to briefly touch base upon Nested Loops in general before proceeding with Python specifically. If a loop exists inside the body of another loop, it is termed as Nested Loop. This means that we want to execute the inner loop ...
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Master Python Loops: For, While, and Nested Loops | by Builescu Daniel | Medium
June 14, 2023 - Master Python Loops: For, While, and Nested Loops Welcome, fellow developers! If you’re on a journey to master Python or just want to brush up your skills, you’ve come to the right place. In this …
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reddit.com › r/learnprogramming › [python] can someone please explain to me how nested for loops work using this example. i don't understand how it works
r/learnprogramming on Reddit: [Python] Can someone please explain to me how nested for loops work using this example. I don't understand how it works
March 11, 2025 -
userInput = int(input())
for i in range(userInput):
for j in range(i,userInput):
print('*', end=' ')
print()input is: 3
the output is:
* * * * * * I have been looking at videos and different websites, but i cannot understand it.
Top answer 1 of 5
10
What does this do? for j in range(i,userInput): print('*', end=' ') If you don't know, try it. Assign values to i and userInput manually and see if you can figure it out.
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Break it down by how the Python interpreter would look at it. The user enters a number. Let's say 3. The first for loop resolves to "for i in range(3)". So for the first loop, i = 0. The second loop then resolves to "for j in range(0, 3)." Because it uses the variable i from the parent loop. That prints "* "three times, because it takes three loops to satisfy range(0, 3) When it completes that, it goes back to the first loop and increments i by 1. The next time the nested loop runs, it's now "for j in range(1, 3)" which will only loop two times. Because the user input is range(3), the first loop will only execute three times before exiting.
Top answer 1 of 11
60
If you're frequently iterating over a Cartesian product like in your example, you might want to investigate Python 2.6's itertools.product -- or write your own if you're in an earlier Python.
from itertools import product
for y, x in product(range(3), repeat=2):
do_something()
for y1, x1 in product(range(3), repeat=2):
do_something_else()
2 of 11
15
This is fairly common when looping over multidimensional spaces. My solution is:
xy_grid = [(x, y) for x in range(3) for y in range(3)]
for x, y in xy_grid:
# do something
for x1, y1 in xy_grid:
# do something else
OpenStax
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5.3 Nested loops - Introduction to Python Programming | OpenStax
March 13, 2024 - A nested loop has one or more loops within the body of another loop. The two loops are referred to as outer loop and inner loop. The outer loop controls the number of the inner loop's full execution.
Programiz PRO
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Understanding Nested Loops in Python with Logic Building
A nested loop is a loop inside another loop. The outer loop determines how many times the inner loop will execute. This is particularly useful for tasks involving multi-row or multi-column structures, such as grids or patterns.
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Nested Loops in Python: Uses, Working, Syntax, Examples
November 5, 2025 - Understand how Python nested loops work, their syntax, and practical examples to enhance your programming skills and solve complex problems efficiently.
Python.org
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Python Code for nested loops - Python Help - Discussions on Python.org
August 31, 2022 - Does anyone know how to print the following pattern using nested loops? 1 1 2 1 2 3 1 2 3 4 1 2 3 4 5
Software Testing Help
softwaretestinghelp.com › home › python programming for beginners – free python tutorials › python loops – for, while, nested loops with examples
Python Loops - For, While, Nested Loops With Examples
April 1, 2025 - However, a third loop[nested loop] can be generated by nesting two or more of these loops. Looping statements in python are used to execute a block of statements or code repeatedly for several times as specified by the user.
Codingem
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Nested Loops in Python: A Complete Guide - codingem.com
January 25, 2024 - A nested loop in Python is a loop inside a loop. This guide teaches you how to work with nested loops in Python with illustrative examples.
Geek Python
geekpython.in › nested-for-loops-in-python
Understanding Nested for Loops in Python - How Does it Work
March 1, 2024 - In Python, nested for loops are loops that have one or more for loops within them.
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Nested loops in Python are easy
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Top answer 1 of 8
84
- Break from the inner loop (if there's nothing else after it)
- Put the outer loop's body in a function and return from the function
- Raise an exception and catch it at the outer level
- Set a flag, break from the inner loop and test it at an outer level.
- Refactor the code so you no longer have to do this.
I would go with 5 every time.
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Here's a bunch of hacky ways to do it:
Create a local function
for a in b: def doWork(): for c in d: for e in f: if somecondition: return # <continue the for a in b loop?> doWork()A better option would be to move doWork somewhere else and pass its state as arguments.
Use an exception
class StopLookingForThings(Exception): pass for a in b: try: for c in d: for e in f: if somecondition: raise StopLookingForThings() except StopLookingForThings: pass
Medium
martinxpn.medium.com › nested-loops-in-python-21-100-days-of-python-8817d1ec028f
Nested loops in Python (21/100 Days of Python) | by Martin Mirakyan | Medium
April 10, 2023 - A nested loop is simply a loop that is inside another loop.