What is the difference between shallow copy and deep copy?
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In Python, the difference between shallow copy and deep copy lies in how they handle nested objects (like lists or dictionaries inside other lists or dictionaries).
🟩 Shallow Copy:
A shallow copy creates a new object, but copies references of the nested objects inside it. This means changes to mutable elements inside the original will reflect in the copy, and vice versa.
Here, only the outer list is copied. The inner lists are shared between original and shallow.
🟦 Deep Copy:
A deep copy creates a completely independent clone of the object and all nested elements. Changes in one object do not affect the other.
Now, modifying deep does not impact original, because even the inner lists are copied.
Use shallow copy for performance when nested data isn’t mutable or won’t be changed. Use deep copy when full independence is required.
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