Python – Copy Dictionaries
1. What Does “Copy Dictionary” Mean?
Copying a dictionary means creating a new dictionary with the same data.
This is useful when:
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You want to change one dictionary
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But keep the original dictionary safe
2. Why Copying is Important
If you don’t copy correctly, both dictionaries may change together 😟
Example (Problem)
👉 Both dictionaries change because they point to the same object.
3. Correct Way to Copy a Dictionary
Method 1: Using copy() (Best Way)
Example
4. Method 2: Using dict() Function
Example
5. Copy Dictionary Using Loop
Example
6. Shallow Copy (Simple Explanation)
All above methods create a shallow copy.
This is fine for simple dictionaries.
7. Common Beginner Mistakes
❌ Using = Instead of Copy
❌ This does NOT create a copy.
✔ Correct
8. Simple Practice Examples
Example 1: Copy and Change
Example 2: Copy Student Data
Example 3: Safe Backup
9. Summary (Copy Dictionaries)
✔ Use copy() to copy dictionary
✔ dict() also works
✔ Never use = for copying
✔ Copy keeps original safe
📘 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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Nested Dictionaries
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Dictionary Methods
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Dictionary Exercises
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Mini Python Projects
Just tell me 😊
