PCPP1 Practice Test 10 — 10 Questions

Question 1

To prevent a user from editing text in a widget, which configuration option should you set?

Accepted Answer

state=tk.DISABLED. Setting 'state' to 'disabled' prevents user interaction with the widget.

Answer

editable=False

Answer

enabled=False

Answer

readonly=True

Question 2

When binding an event to a widget using 'widget.bind('<Key>', handler)', the handler function receives an event object. How do you access the specific character pressed?

Accepted Answer

handler(event.char). The event object passed to the handler contains the 'char' attribute which holds the character pressed.

Answer

handler(event.keysym)

Answer

handler(event.get_char())

Answer

handler(event.key)

Answer

difficulty

Question 3

Which THREE of the following represent common issues when using __slots__?

Accepted Answer

Subclasses must define their own __slots__ to avoid creating a __dict__.. Slots can break pickling in some cases, make multiple inheritance tricky, and prevent adding attributes dynamically.

Answer

They are incompatible with all decorators.

Answer

They prevent the use of multiple inheritance.

Question 4

Which TWO of the following are secure coding practices in Python?

Accepted Answer

Avoid using 'pickle' for untrusted data.. Avoiding dangerous functions and validating all inputs are key security practices.

Answer

Use 'subprocess' with 'shell=True'.

Answer

Always use 'eval()' for dynamic execution.

Answer

Use hardcoded credentials for database connections.

Question 5

You want to trigger a function when a user releases a key. Which event string should you use with bind()?

Accepted Answer

. The '' event is used to detect when a key is released.

Answer

<Key-Up>

Answer

Answer

<KeyUp>

Question 6

You have a Button widget and want to trigger a function named 'process_data' when the user clicks it. Which is the standard way to associate the function with the button?

Accepted Answer

button = Button(root, command=process_data). The 'command' parameter is the standard way to bind a callback function to a button click event.

Answer

button = Button(root, event=process_data)

Answer

button.bind('<Button-1>', process_data)

Answer

button.set_action(process_data)

Question 7

Which TWO of the following are true regarding multiple inheritance in Python?

Accepted Answer

super() is used for cooperative method calls.. Python uses C3 MRO to resolve calls, and super() is used for cooperative calls.

Answer

It is not supported.

Answer

The MRO is determined at runtime.

Answer

Multiple inheritance is always preferred over composition.

Question 8

In the context of the Factory pattern, what does a concrete factory implement?

Accepted Answer

The creation interface for specific product variants.. A concrete factory implements the interface defined by the abstract factory to produce specific products.

Answer

The registration logic for all factories.

Answer

The logic for the singleton pattern.

Answer

The product logic.

Question 9

You are building a REST client that needs to handle 429 Too Many Requests status codes. Which strategy is most effective when implementing an automatic retry mechanism?

Accepted Answer

Implement an exponential backoff strategy with jitter. Implementing exponential backoff ensures that you do not overwhelm the server while waiting for the rate limit to reset.

Answer

Switch to a different base URL immediately

Answer

Ignore 429 errors and continue execution

Answer

Retry immediately in a loop until successful

Question 10

When using 'requests.get()', how can you include a custom HTTP header in your request?

Accepted Answer

Use the 'headers' dictionary argument. The 'headers' parameter accepts a dictionary of HTTP headers.

Answer

Use the 'data' argument

Answer

Pass it as part of the URL string

Answer

Use the 'params' dictionary