CS 162

Question 1

Where would an else block go in exception handling?

Answer 1

After the except block(s)

Question 2

Under what conditions does the else block execute in exception handling?

Answer 2

Only if the code in the try block doesn’t cause any exceptions

Question 3

What has mostly replaced the practice of using a finally block to release a resource the program is using (e.g., closing a file)?

Answer 3

The with statement - in re file handling

Question 4

Is the finally block required or optional?

Answer 4

Optional

Question 5

Syntax for inheritance (showing the is-a relationship)

Answer 5

class Duck(Bird):
as opposed to just:
class Duck:

Question 6

constructor

Answer 6

The __init__() method in Python; used to instantiate an object. It initializes assigned values to the data members.

Question 7

What do GUIs use inheritance for?

Answer 7

To create a hierarchy of windows, panes, dialog boxes, buttons, etc.

Question 8

object composition

Answer 8

When one class contains an object of another class as one of its data members.

Question 9

Syntax for super() in the init method

Answer 9

For a child class inheriting 2 of 3 arguments from super:
def \_\_init\_\_(self, library_item_id, title, author):
    super().\_\_init\_\_(library_item_id, title)
    self._author = author

Question 10

Difference b/t return double and return double()

Answer 10

“return double” returns the actual function; “return double()” returns the output of the function call (though you would prob need arguments). Remember that functions are first-class objects and can be returned!

Question 11

how to make a copy of a list

Answer 11

list_2 = list(list_1)