PCPP1 Practice Test 14 — 15 Questions

Question 1

Which THREE of the following are valid ways to pass data to a REST API using 'requests'?

Accepted Answer

json. The 'params', 'data', and 'json' arguments allow different ways of sending information in requests.

Answer

socket

Answer

url

Question 2

When executing a SQL query with parameters in sqlite3, why should you use placeholders (e.g., ?) rather than f-strings?

Accepted Answer

It prevents SQL injection vulnerabilities.. Using placeholders prevents SQL injection attacks and allows the library to handle type conversions.

Answer

It is required for SELECT queries only.

Answer

It enables automatic commit behavior.

Answer

It is faster to execute.

Question 3

What is the recommended way to handle a function that requires a large number of arguments?

Accepted Answer

Group related parameters into a dataclass or object.. If a function has too many arguments, it is often a sign it should be broken down or that a configuration object should be used.

Answer

Just define the function with many arguments; it is perfectly fine.

Answer

Use a single argument dictionary.

Answer

Use *args and **kwargs for everything.

Question 4

Which TWO practices ensure secure handling of sensitive environment configurations?

Accepted Answer

Add '.env' to your '.gitignore' file.. Using .env files and ignoring them in version control is the standard.

Answer

Commit .env files to the code repository.

Answer

Store secrets in code comments.

Answer

Share the '.env' file via email.

Question 5

You are creating a simple Tkinter application and notice that your window does not appear on the screen after calling the Tk() constructor. Which method must be called to start the event loop?

Accepted Answer

root.mainloop(). The mainloop() method is required to start the Tkinter event loop, which listens for events and updates the display.

Answer

root.show()

Answer

root.render()

Answer

root.run()

Question 6

Which THREE of the following are valid Tkinter variable classes used for tracking widget states?

Accepted Answer

IntVar. StringVar, IntVar, DoubleVar, and BooleanVar are the standard Tkinter variable classes.

Answer

FloatVar

Answer

CharVar

Question 7

What is the purpose of the __set_name__ method in descriptors?

Accepted Answer

To allow the descriptor to know its name in the owner class.. __set_name__ is called at class creation time to inform the descriptor of its name in the owner class, allowing it to store values in a private attribute without needing to know the name beforehand.

Answer

To set the name of the class.

Answer

To delete the attribute.

Answer

To rename the attribute.

Question 8

When using configparser, how do you retrieve a value as a boolean?

Accepted Answer

parser.getboolean('section', 'option'). The getboolean() method converts common truthy/falsy values automatically.

Answer

parser.get('section', 'option', type=bool)

Answer

parser.get_bool('section', 'option')

Answer

bool(parser.get('section', 'option'))

Question 9

Which TWO of these are valid PEP 8 recommendations for whitespace?

Accepted Answer

Avoid trailing whitespace.. Avoid trailing whitespace and use spaces around assignments only if necessary.

Answer

Use two spaces for every level of indentation.

Answer

Use large blocks of whitespace between functions.

Answer

Use tabs for all indentation.

Question 10

You want to create a button that closes the GUI application when clicked. Which method should you call inside the command callback?

Accepted Answer

root.destroy(). The destroy() method on the root window object terminates the Tkinter application.

Answer

root.close()

Answer

root.exit()

Answer

root.quit()

Question 11

When should you use absolute imports over relative imports in a large project?

Accepted Answer

Always, as they are PEP 8 recommended for clarity and robustness.. Absolute imports are recommended by PEP 8 because they are clearer and avoid ambiguity in complex package structures.

Answer

When the file is in the same directory.

Answer

Only if using Python 2.

Answer

When performance is the main priority.

Question 12

How should one handle the 'KeyboardInterrupt' exception if it must be caught for cleanup purposes?

Accepted Answer

Catch it, clean up resources, and then use 'raise'.. You should catch it, perform the cleanup, and then re-raise it so the application still shuts down gracefully.

Answer

Prevent it by setting a signal handler for SIGINT.

Answer

Use a bare 'except:' clause.

Answer

Catch it and ignore it to keep the app running.

Question 13

You have a Tkinter Entry widget and want to retrieve the text currently entered by the user. Which method do you call on the Entry instance?

Accepted Answer

entry.get(). The get() method is used to retrieve the current contents of Entry and Text widgets.

Answer

entry.content()

Answer

entry.text()

Answer

entry.value()

Question 14

Which TWO of the following are valid geometry managers in Tkinter?

Accepted Answer

pack. pack, grid, and place are the three built-in geometry managers in Tkinter.

Answer

block

Answer

align

Answer

flow

Question 15

You are consuming a REST API that returns data in JSON format. After calling response.json(), you notice the data contains nested dictionaries. What is the most Pythonic way to handle a missing key in the response dictionary safely?

Accepted Answer

Use response.json().get('key', default_value). The dict.get() method provides a way to access a key with a default value if the key does not exist, preventing a KeyError.

Answer

Wrap the access in a try-except KeyError block

Answer

Check 'if 'key' in response.json():' before access

Answer

Use response.json()['key'] and assume the API schema is always correct