Python frozenset
1. What is a frozenset?
A frozenset is just like a set, but with one big difference 👇
👉 A frozenset cannot be changed.
In simple words:
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set → changeable
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frozenset → NOT changeable (fixed)
2. Why Do We Need frozenset?
We use frozenset when:
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Data should not change
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We want safety
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We want to use a set as a key in dictionary
3. Creating a frozenset
We create a frozenset using the frozenset() function.
Example
Using Tuple
4. frozenset Removes Duplicates
Just like set, duplicates are removed.
Example
Output:
5. frozenset is Unordered
Items have no fixed order.
Example
6. Access frozenset Items (Using Loop)
You cannot use index, but you can use a loop.
Example
7. Check Item Exists
Example
8. frozenset Cannot Be Changed (Important)
❌ Wrong Examples
❌ Error: frozenset is immutable.
9. frozenset Methods (Allowed)
frozenset supports read-only methods.
Union
Intersection
Difference
10. frozenset vs set (Simple Table)
| Feature | set | frozenset |
|---|---|---|
| Changeable | Yes | No |
| Duplicate allowed | No | No |
| Add / Remove | Yes | No |
| Can be dict key | No | Yes |
11. frozenset as Dictionary Key
Example
12. Common Beginner Mistakes
❌ Trying to Modify frozenset
❌ Not allowed.
❌ Expecting Order
Order is not fixed.
13. Simple Practice Examples
Example 1: Create frozenset
Example 2: Check Membership
Example 3: Join frozensets
14. Summary (Python frozenset)
✔ frozenset is immutable
✔ No add or remove
✔ Removes duplicates
✔ Can be dictionary key
✔ Safer than set
📘 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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frozenset Exercises
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Dictionary Basics (easy)
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Dictionary Methods
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Set vs frozenset vs list vs tuple
Just tell me 😊
