Session 5

Which of the following are true of Python lists?

• All elements must be of the same type

• These represent the same list: ['a', 'b', 'c'] and ['c', 'a', 'b']

• A list may contain any type except another list

• There is no conceptual limit to the size of a list

• A given object may appear in a list more than once

List a is defined as follows: a = [1, 2, 3, 4, 5]

Statements that remove the middle element 3 from a:

• a.remove(3)

• del a[2]

• a[2] = [ ]

• a[2:2] = [ ]

• a[2:3] = [ ]

List a is defined as follows: a = ['a', 'b', 'c']

To add 'd' and 'e' to the end, so that the answer is a = ['a', 'b', 'c', 'd', 'e']

Which statements are true?

• a += ['d', 'e']

• a.append(['d', 'e'])

• a = ['a', 'b', 'c', 'd', 'e']

• a[len(a):] = ['d', 'e']

Which function counts elements in a list?

• find()

• index()

• count()

• len()

Let list1 = [2, 4, 6, 8, 10].

What will print(list1[-2]) result in?

• 6

• 8

• error

• -2

Which statement is NOT correct?

• A list is mutable

• The append function is used to add an element

• A tuple is immutable

• The extend function adds an element to a tuple

Can lists contain tuples and vice versa?

• Yes

• No

Suppose list1 is [1, 3, 2]

What is list1 * 2?

• [2,6,4]

• [1,3,2,3,2,1]

• [1,3,2,1,3]

• [1,3,2,1,3,2]

Identify the data type of T:

T = ['A', '23', '92', '(10,20)']

• Dictionary

• List

• String

• Tuple

What type of data is: list_ = [(1,1),(2,2),(3,3),(4,4),(5,5)]

• Invalid type

• Tuple of lists

• List of tuples

• list_ is tuple