copy() of Lists in Python
copy() of Lists in Python
The copy() method returns the copy of the list in python.
When we use the “=” sign to copy the list, if we modify the copied list then changes are also reflected back in the original list. So here we have to create a shallow copy of the list such that when we modify something in the copied list, changes are not reflected back in the original list.
copy() of Lists in Python
In Python, you can create a copy of a list using the copy() method or by using slicing. You can use the copy() method to create a shallow copy of a list. A shallow copy means that the new list will contain references to the same objects as the original list.
Syntax :
Return Type :
The copy() method returns a shallow copy of the list in python.
Using the copy() method
#copy() in python list
myList = [ 1, 2, 9, 4, 4, 2 ]
#all the values of myList is copied to the copyList
copyList = myList.copy()
print("Before Adding Element")
print(myList)
print(copyList)
#modifying copied list
copyList.append(10)
#changes is reflected in only copyList not in myList
print("After adding new element in copyList")
print(myList)
print(copyList)
Output : Before Adding Element [1, 2, 9, 4, 4, 2] [1, 2, 9, 4, 4, 2] After adding new element in copyList [1, 2, 9, 4, 4, 2] [1, 2, 9, 4, 4, 2, 10]
Using ” = ” Operator
# "=" in python list
myList = [ 1, 2, 9, 4, 4, 2 ]
#all the values of myList is assigned to the copyList
copyList = myList
print("Before Adding Element")
print(myList)
print(copyList)
#modifying copied List
copyList.append(10)
#changes is reflected in only copyList not in myList
print("After adding new element in copyList")
print(myList)
print(copyList)
Output : Before Adding Element [1, 2, 9, 4, 4, 2] [1, 2, 9, 4, 4, 2] After adding new element in copyList [1, 2, 9, 4, 4, 2, 10] [1, 2, 9, 4, 4, 2, 10]
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