Nested Loops in Python Explained

Published: 18 September 2025
on channel: PrograLabs

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Learn how to use nested loops in Python to create shapes with any symbol you want!

In this video, you'll learn how to use nested loops in Python, a fundamental technique for building patterns and repetitive structures like rectangles and triangles in the console. You'll learn how to control the number of rows and columns, the symbol that is printed, and how to combine `print()` with `end=""` to customize the output. This tutorial is designed for beginners and will help you visualize how nesting logic works step by step. Ideal for strengthening your Python programming logic!

✨ Key Benefits
• You'll learn how to use nested loops (for loops within for loops) in Python.

• You'll create custom rectangles with the symbol, rows, and columns the user chooses.

• You'll discover how to build increasing triangles using progressive logic.

• You will understand the use of `range()`, `end=""`, and how to control the print flow in the console.

• You will have a solid foundation to move on to more complex visual projects in Python.

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⏱️ Video content:
00:00 Why use a nested loop?

00:15 Example 1: Counting Numbers with a For Loop
01:02 Using `end` in `print`
01:30 Repeating the Sequence with Nested Loops
02:45 Creating a Rectangle in Python
03:00 Input and Conversion to `int`
04:05 Controlling Rows and Columns
04:49 Drawing Shapes with Nested Loops
05:42 Creating a Triangle in Python
06:30 Correct Range for Triangles
07:14 Logic of the Inner Loop
08:18 Common Error with `range`
08:55 Review of Concepts
09:13 Video Closing

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