Lists 9

How can you copy a list in Python to avoid changes in the copied list affecting the original list?

• By re-declaring the list (list2 = ['apple', 'banana', 'cherry'])

• Using the copy() method (list2 = list1.copy())

• By directly assigning it (list2 = list1)

• Using the append() method

Answer explanation

Using the copy() method (list2 = list1.copy()) creates a separate copy of the original list, ensuring changes made to the copied list do not affect the original list.

What is another method to copy a list in Python besides the copy() method?

• Using the list() method (list2 = list(list1))

• Using the clone() method

• By slicing the list (list2 = list1[:])

• Using the duplicate() method

Answer explanation

The correct method to copy a list in Python besides the copy() method is by using the list() method (list2 = list(list1)). This creates a new copy of the list.

Why can't you copy a list by simply typing list2 = list1?

• Because it will merge list1 into list2

• Because it will delete list1

• Because list2 will only be a reference to list1

• Because it will create a new list

Answer explanation

Because list2 will only be a reference to list1

What happens to list2 when changes are made to list1 if list2 = list1?

• list2 will only update if it's a string list

• list1 becomes empty

• list2 automatically updates to match list1

• list2 remains unchanged

Answer explanation

list2 automatically updates to match list1 because they are referencing the same list object in memory.

Which method is not a valid way to copy a list in Python?

• Using the copy() method

• Using the list() method

• Using the clone() method

• By slicing the list

Answer explanation

Using the clone() method is not a valid way to copy a list in Python. The correct methods are using the copy() method, the list() method, or by slicing the list.

What is the correct syntax to make a copy of a list using the copy() method?

• copy(list2 = list1)

• list2 = list1->copy()

• list2 = list1.copy()

• list2 = copy(list1)

Answer explanation

The correct syntax to make a copy of a list using the copy() method is list2 = list1.copy()

Which of the following is not a feature of copying a list using the list() method?

• It creates a shallow copy of the list

• It is a built-in method

• It requires the original list as an argument

• It deep copies all objects within the list

Answer explanation

The correct choice is that the list() method does not deep copy all objects within the list, it only creates a shallow copy.

What is the result of copying a list using the copy() method in terms of the copied list's independence from the original list?

• The copied list is completely independent of the original list

• The copied list is still linked to the original list

• The copied list cannot be modified

• The copied list will merge with the original list upon modification

Answer explanation

The copied list is completely independent of the original list

In Python, what does slicing a list (list2 = list1[:]) achieve in terms of copying?

• It merges list1 into list2

• It creates a reference to list1 in list2

• It creates a shallow copy of list1

• It deep copies list1 into list2

Answer explanation

Slicing a list in Python (list2 = list1[:]) creates a shallow copy of list1, not a reference or deep copy.

Which of the following options correctly demonstrates how to copy a list using the list() method?

• list2 = list1.copy(list)

• list2 = new list(list1)

• list2 = list1.list()

• list2 = list(list1)

Answer explanation

The correct choice is 'list2 = list(list1)' because the list() method creates a shallow copy of the list, allowing you to duplicate the original list.