Python – Join Lists

1. What Does “Join Lists” Mean?

Joining lists means combining two or more lists into one list.

This is useful when:

• You have data in different lists

• You want them together in one list

2. Join Lists Using + Operator

The easiest way to join lists is using +.

Example

Output:

👉 This creates a new list.

3. Join Lists Using extend()

extend() adds items of one list to the end of another list.

Example

👉 This changes the first list.

4. Join Lists Using Loop

You can join lists manually using a loop.

Example

5. Join Multiple Lists

Example

6. Join Lists with Different Data Types

Lists can store mixed data.

Example

7. Common Beginner Mistakes

❌ Using append() Instead of extend()

Result:

✔ Correct:

❌ Expecting extend() to return list

❌ extend() returns None.

8. Simple Practice Examples

Example 1: Join Student Names

Example 2: Join Numbers

Example 3: Join Using Loop

9. Summary (Join Lists)

✔ + creates new list
✔ extend() adds to existing list
✔ Loop method also works
✔ Avoid append() for joining lists

📘 Perfect for Beginner eBook

This chapter is ideal for:

• Python beginner books

• School & college students

• Self-learners

If you want next, I can write:

• Tuple Basics

• Set Basics

• Dictionary Basics

• List Exercises

• MCQs with answers

Just tell me 😊