Lists

Topics in this chapter

• List Creation, Indexing and Basic Operations
• List Slicing, Operators and Assignment
• List Mutability and Built-in Methods
• Aliasing, References and Nested Lists
• List Comprehensions and Filtering

Cheat sheet

Practice questions

1. Question 1Q-EB49C1

   What is the value of nums after executing nums = [2, 4, 6]; nums.insert(1, 3)?

   1. A.[2, 4, 3, 6]
   2. B.[2, 3, 4, 6]
   3. C.[3, 2, 4, 6]
   4. D.[2, 4, 6, 3]
   See the answer and solution
2. Question 2Q-16891D

   Explain the difference between append() and extend() in Python lists, using the following statements: x = [1, 2]; x.append([3, 4]) and y = [1, 2]; y.extend([3, 4]).

   See the answer and solution
3. Question 3Q-F66236

   What is printed by the following Python code? a = [10, 20, 30]; b = a; c = a[:]; b[1] = 99; c.append(40); print(a, c)

   1. A.[10, 99, 30] [10, 20, 30, 40]
   2. B.[10, 20, 30] [10, 20, 30, 40]
   3. C.[10, 99, 30, 40] [10, 20, 30]
   4. D.[10, 99, 30] [10, 99, 30, 40]
   See the answer and solution
4. Question 4Q-CB01B3

   What is printed by the following Python code? values = [5, 10, 15, 20, 25]; print(values[1:4])

   1. A.[5, 10, 15]
   2. B.[10, 15, 20]
   3. C.[10, 15, 20, 25]
   4. D.[15, 20]
   See the answer and solution
5. Question 5Q-6B19A5

   What is the output of the following Python code? numbers = [3, 1, 2]; result = numbers.sort(); print(result, numbers)

   1. A.None [1, 2, 3]
   2. B.[1, 2, 3] None
   3. C.[3, 1, 2] None
   4. D.None [3, 1, 2]
   See the answer and solution