Worksheet 1 - List

-- Worksheet 1 --

[ List ]

(Fill-in-the-blanks and short questions)

Fill-in-the-blanks

Part A: Basics of Lists

 

1. A list refers to a __________ of data which are normally __________.

 

2. Instead of storing related data as separate __________, we can store them as a __________.

 

3. When printed as output, lists are ordered __________

 

4. When declaring a list, square __________ are used.

 

5. Values in a list are separated by a __________.

 

 

Part B: Declaring Lists

 

6. The syntax for declaring a list is

   `listName = __________`

 

7. An example of a list that stores five ages is:

   `userAge = __________________________`

 

8. To declare an empty list, we write:

   `listName = __________`

 

9. To add values to an empty list, we use the __________() method.

 

Part C: Accessing Values

 

10. List indexes always start from __________.

 

11. The first item in a list has an index of __________.

 

12. The last item in a list can be accessed using the index __________.

 

13. In the list `userAge = [21, 22, 23, 24, 25]`, the value accessed by `userAge[1]` is __________.

 

14. In the same list, the value accessed by `userAge[-2]` is __________.

 

 

Part D: Assigning and Slicing

 

15. If we write `userAge2 = userAge`, then `userAge2` becomes __________.

 

16. The notation `2:4` is known as a __________.

 

17. In slice notation, the start index is always __________ and the end index is always __________.

 

18. The slice `userAge[2:4]` results in the list __________.

 

19. The third number in a slice is called the __________.

 

20. The slice `userAge[1:5:2]` results in the list __________.

 

21. The default starting index for slicing is __________.

 

22. The default ending index for slicing is __________.

 

Part E: Modifying Lists

 

23. To modify an item in a list, we use the syntax:

    `listName[__________] = __________`

 

24. If `userAge = [21, 22, 23, 24, 25]` and we write `userAge[1] = 5`, the new list is __________.

 

Part F: Adding and Removing Items

 

25. The method used to add an item to the end of a list is __________().

 

26. If we write `userAge.append(99)`, the value 99 is added to the __________ of the list.

 

27. To remove an item from a list, we use the __________ statement.

 

28. If we write `del userAge[2]`, the __________ item is removed.

Short questions

1. What is a list in Python, and why is it useful?

_________________________________________

_________________________________________

 

2. Write the correct syntax to create a list called `numbers` with values 1, 2, and 3.

_________________________________________

 

3. Which brackets are used to declare a list?

_________________________________________

 

4. What is the index of the first item in a list?

_________________________________________

5. Given `userAge = [21, 22, 23, 24, 25]`, what value does `userAge[2]` return?

_________________________________________

 

6. Using the same list, what value does `userAge[-1]` return?

_________________________________________

 

7. How do you declare an empty list called `items`?

_________________________________________

 

8. What does the slice `userAge[1:4]` return?

_________________________________________

 

9. Explain what the slice notation `2:4` means.

_________________________________________

 

10. What is the result of `userAge[1:5:2]`?

_________________________________________

 

11. How do you change the value `22` in `userAge` to `5`?

_________________________________________

 

12. What do the following two commands do:

    a) `userAge.append(99)`

    b) `del userAge[2]`

_________________________________________

_________________________________________

 

13. Define the term index.

_________________________________________