Python Quiz: Module 4

List of Lists

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1. How can the PyCharm debugger help you as a developer?
   • A. You can modify program data as the program is running.
   • B. It allows you to step through your code to verify the flow.
   • C. It will correct all of your errors.
   • D. You can see variable reference addresses.
2. Which of the following actions take place when you open a file in write mode?
   • A. If the file exists the data in it will be overwritten.
   • B. If the file doesn't exist, a new one will be created.
   • C. If the file exists, new data will be written after the existing data.
   • D. If you have opened a file in write mode, you must close it and reopen it to continue writing to it.
3. Which of the following commands will allow you to write data to a file?
   • A. file = open(FILENAME, 'r')
   • B. file = open(FILENAME, 'a')
   • C. file = open(FILENAME, 'l')
   • D. file = open(FILENAME, 'w')
4. If file has been opened in read mode, which of the following will read one line of data at a time
   • A. file.append
   • B. file.readlines
   • C. file.read
   • D. file.readline
5. What is the difference between file.read() and file.readlines()?
   • A. file.read reads one line at a time and file.readlines() counts the number of lines in the file
   • B. file.read reads the entire file as a string and file.readlines() counts the number of lines in the file
   • C. file.read reads the entire file as a string and file.readlines() reads the entire file and segregates the file into separate lines
   • D. file.read reads a line at a time and file.readlines() reads the entire file
6. Using with open("hello.txt") as my_file: guarantees which of the following after the block of code following the : is executed?
   • A. The program will automatically exit.
   • B. The file will be automatically closed without writing file.close().
   • C. The program will ignore any other command regarding the file.
   • D. The block of code must contain a file.close() statement.

7. Which if the following is a tuple?

   • A. {a: 1, b:2}
   • B. {'a', 1, 'b', 2}
   • C. ('a', 1, 'b', 2)
   • D. ['a',1,'b',2]

8. Which if the following is a list?

   • A. {a: 1, b:2}
   • B. {'a', 1, 'b', 2}
   • C. ('a', 1, 'b', 2)
   • D. ['a',1,'b',2]

9. Which if the following is a set?

   • A. {a: 1, b:2}
   • B. {'a', 1, 'b', 2}
   • C. ('a', 1, 'b', 2)
   • D. ['a',1,'b',2]

10. Which if the following is a dictionary?

    • A. {a: 1, b:2}
    • B. {'a', 1, 'b', 2}
    • C. ('a', 1, 'b', 2)
    • D. ['a',1,'b',2]

11. What is the use case for a tuple?

    • A. Working with a collection of data the needs to be changed frequently.
    • B. Working with a collection of data from a database where you need to maintain integrity by enforcing nonmutability.
    • C. Working with a collection of data that must contain unique values.
    • D. Working with a collection of data that must be easy to look up using a unique key.

12. What is the use case for a dictionary?

    • A. Working with a collection of data the needs to be changed frequently.
    • B. Working with a collection of data from a database where you need to maintain integrity by enforcing nonmutability.
    • C. Working with a collection of data that must contain unique values.
    • D. Working with a collection of data that must be easy to look up using a unique key.

13. What is the use case for a list?

    • A. Working with a collection of data the needs to be changed frequently.
    • B. Working with a collection of data from a database where you need to maintain integrity by enforcing nonmutability.
    • C. Working with a collection of data that must contain unique values.
    • D. Working with a collection of data that must be easy to look up using a unique key.

14. What is the use case for a set?

    • A. Working with a collection of data the needs to be changed frequently.
    • B. Working with a collection of data from a database where you need to maintain integrity by enforcing nonmutability.
    • C. Working with a collection of data that must contain unique values.
    • D. Working with a collection of data that must be easy to look up using a unique key.

15. Python strings are mutable.

    • True
    • False

16. Lists and Tuples are ordered collections.

    • True
    • False

17. If `data_list = ['a', 'b', 'c'] which of the following will unpack the list?

    • A. e,f,g = data_list
    • B. (e,f,g) = data_list
    • C. {e,f,g} = data_list
    • D. [e,f,g] = data_list

18. If you want to split a string from a CSV file in order to create a list, why is it important to strip the string before splitting it?

    • A. The split function requires that you strip the string first.
    • B. The CSV file will contain a \n at the end of the line and the strip function will remove it before separating the comma separated strings.
    • C. You must strip all data in order to create a list.
    • D. There's no need to strip a string unless it contains an extra blank space at the beginning or end of string.