Python – Join Lists
1. What Does “Join Lists” Mean?
Joining lists means combining two or more lists into one list.
This is useful when:
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You have data in different lists
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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:
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Python beginner books
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School & college students
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Self-learners
If you want next, I can write:
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Tuple Basics
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Set Basics
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Dictionary Basics
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List Exercises
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MCQs with answers
Just tell me 😊
