copy in Python

Question

Is "import copy" necessary in python while we are copying a tuple.
Example-1:
import copy
old_list = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
new_list = copy.copy(old_list)

Example-2:
old_list = [[1, 1, 1], [2, 2, 2], [3, 3, 3]]
new_list =old_list.copy()

Both example 1 and 2 is working.

Answer 1

1. AttributeError: 'tuple' object has no attribute 'copy'.

2. list.copy() and dict.copy() are built-in functions for shallow copies. They're available since Python 3.4.

3. copy.copy() can also copy functions and classes.

Answer 2

harshit I was talking about the original question.

"Is 'import copy' necessary in Python while we are copying a tuple?"

Answer 3

Diego in point number 1, why we use tuple ? It is not mutable so using copy doesn't make sense ?

Answer 4

Kishalaya Saha please see this

Answer 5

Sorry, I'm not sure what you're confused about. It seems your questions have already been answered. Anyway, tuples might contain nested lists as elements, and those guys could be changed. So a deep copy might be necessary sometimes.