Python – Add Set Items

1. What Does “Add Set Items” Mean?

Adding set items means putting new values into a set.

Remember:
👉 Sets store only unique values.
👉 Duplicate values are not added.

2. Add One Item to a Set (add())

Use add() to add one item.

Example

3. Add Multiple Items to a Set (update())

Use update() to add many items.

Example

4. Add Items from Another Set

Example

5. Duplicate Items Are Ignored

Example

Output:

6. Add Items Using Loop

Example

7. Create Empty Set and Add Items

Example

8. Common Beginner Mistakes

❌ Using append() with Set

❌ Error: set has no append.

❌ Creating Empty Set Wrong Way

This creates a dictionary.

✔ Correct:

9. Simple Practice Examples

Example 1: Add City

Example 2: Add Multiple Numbers

Example 3: Ignore Duplicate

10. Summary (Add Set Items)

✔ Use add() for one item
✔ Use update() for many items
✔ Duplicates are ignored
✔ Sets store unique values
✔ Use set() for empty set

📘 Perfect for Beginner eBook

This chapter is ideal for:

• Python beginner books

• School & college students

• Self-learners

If you want next, I can write:

• Remove Set Items

• Join Sets

• Set Methods (full)

• Set Exercises

Just tell me 😊