INTRODUCTION – Work with Strings and Lists

TEST YOUR KNOWLEDGE: WORK WITH STRINGS

1. Which of the following statements correctly describes strings? Select all that apply.

2. What does the following code return?

device_id = "uu0ktt0vwugjyf2"
print(device_id[2:5])

3. What does the following code display?

device_id = "Tj1C58Dakx"
print(device_id.lower())

4. You want to find the index where the substring “192.168.243.140” starts within the string contained in the variable ip_addresses. Complete the Python code to find and display the starting index. (If you want to undo your changes to the code, you can click the Reset button.)

What index does the substring “192.168.243.140” start at?

5. What does the code print(“HELLO”[2:4]) output?

TEST YOUR KNOWLEDGE: WORK WITH LISTS AND DEVELOP ALGORITHMS

1. Review the following code:

my_list = ["a", "b", "c", "d"]
my_list[2] = 4
print(my_list)

What will it display?

2. You are working with the list [“cwvQSQ”,”QvPvX5″,”ISyT3a”,”S7vgN0″]. Its elements represent machine IDs, and the list is stored in a variable named machine_ids. Which line of code will add the ID of “yihhLL” at index 3?

3. Which line of code will remove the username “tshah” from the following list?

access_list = [“elarson”, “bmoreno”, “tshah”, “sgilmore”]

4. As a security analyst, you are responsible for developing an algorithm that automates removing usernames that match specific criteria from an access list. What Python components would help you implement this? Select three answers.

5. In the list [“elarson”, “bmoreno”, “tshah”, “eraab”], which element has an index of 3?

TEST YOUR KNOWLEDGE: REGULAR EXPRESSIONS

1. Which regular expression symbol represents one or more occurrences of a specific character?

2. As a security analyst, you are responsible for finding employee IDs that end with the character and number sequence “a6v”. Given that employee IDs consist of both numbers and alphabetic characters and are at least four characters long, which regular expression pattern would you use?

3. You have imported the re module into Python with the code import re. You want to use the findall() function to search through a string. Which function call enables you to search through the string contained in the variable text in order to return all matches to a regular expression stored in the variable pattern?

4. Which of the following strings would Python return as matches to the regular expression pattern “\w+”? Select all that apply.

5. Which string matches with the regular expression “b\wa+b”?

MODULE 3 CHALLENGE

1. What is the output of the following code?

print(len("125"))

2. Which line of code returns a copy of the string “bmoreno” as “BMORENO”?

3. In the string “network”, which character has an index of 1?

4. You need to take a slice from a network ID. Specifically, you must extract the characters with indices of 6 through 10. Complete the Python code to take this slice and display it. (If you want to undo your changes to the code, you can click the Reset button.)

What string does the code output?

5. What is the output of the following code?

username_list  = ["elarson", "bmoreno", "tshah"] 
device_id_list = ["us2c0R5", "2R78TBR", "bt3MIEz"]
print(username_list + device_id_list)

6. A variable named my_list contains the list [1,2,3,4]. Which line of code adds the element 5 to the end of the list?

7. Fill in the blank: Determining that you need to use string slicing and a for loop to extract information from items in a list is part of creating a(n) _____.

8. Which of the following strings would Python return as matches to the regular expression of “\w+”? Select all that apply.

9. What module do you need to import to use regular expressions in Python?

10. What does the code username_list.append(“bmoreno”) method do?

11. Which line of code converts the integer 7 to a string?

12. Which line of code returns a copy of the string “HG91AB2” as “hg91ab2”?

13. What is the index of the character “4” in the string “h204D3921”?

14. You need to take a slice from an employee ID. Specifically, you must extract the characters with indices of 3, 4, 5, and 6. Complete the Python code to take this slice and display it. (If you want to undo your changes to the code, you can click the Reset button.)

What string does the code output?

15. What is the output of the following code?

list1 = [1, 2, 3] 
list2 = ["a", "b", "c"]
print(list1 + list2)

16. What is an algorithm?

17. What does the \w symbol match to in a regular expression?

18. What does the re.findall() function return?

19. Which code joins a list of new_users to a list of approved_users and assigns the value to a third variable named users?

20. Which of the following strings would Python return as matches to the regular expression pattern of  “\w”? Select all that apply.

21. You have imported the re module into Python with the code import re. Which code searches the device_ids string variable for a pattern of “r15\w+”?

22. Which method adds input to the end of a list?

23. Which line of code returns the number of characters in the string assigned to the username variable?

24. What is the result when .upper() is applied to a string?

25. What is the output of the following code?

approved_users = ["bmoreno", "elarson", "tshah", "eraab"]
print(approved_users[1])

26. What does the code device_ids.append(“h32rb17”) do?

27. What is the index of the character “c” in the string “encryption”?

28. You need to take a slice from a device ID. Specifically, you must extract the characters with indices of 8, 9, and 10. Complete the Python code to take this slice and display it. (If you want to undo your changes to the code, you can click the Reset button.)

What string does the code output?

CONCLUSION – Work with Strings and Lists