PCPP1 Practice Test 2 — 10 Questions

Question 1

You have a list of options and want the user to select one using a dropdown menu. Which widget should you use?

Accepted Answer

tk.OptionMenu(). The OptionMenu widget is the standard tool for creating a dropdown selection list.

Answer

tk.ComboBox()

Answer

tk.Select()

Answer

tk.Dropdown()

Question 2

Why should you use super() instead of calling the parent class method directly by name?

Accepted Answer

It correctly resolves the next method in the MRO.. super() respects the MRO and allows for cooperative multiple inheritance, whereas hard-coding the class name breaks if the hierarchy is modified.

Answer

It is required for private methods.

Answer

It is faster.

Answer

It makes the code more verbose.

Question 3

A script processes data from untrusted sources. Which technique best mitigates 'pickle' deserialization vulnerabilities?

Accepted Answer

Use an alternative format like JSON or XML for serialization.. The 'pickle' module is fundamentally insecure; using secure formats like JSON is the only way to avoid code injection during deserialization.

Answer

Only unpickle from files with a specific extension.

Answer

Wrap the unpickling in a try-except block.

Answer

Use 'pickle.load()' with a restricted whitelist of modules.

Question 4

In the context of writing robust error handling, what is the 'EAFP' principle?

Accepted Answer

Easier to Ask for Forgiveness than Permission.. EAFP stands for 'Easier to Ask for Forgiveness than Permission', which encourages using try-except blocks instead of pre-checking states.

Answer

Ensure All Functions Pass.

Answer

Exit All Files Properly.

Answer

Evaluate All Faults Promptly.

Question 5

Which TWO of the following methods are commonly used to update a Tkinter widget's state or appearance dynamically?

Accepted Answer

widget.config(state='disabled'). The config() method and specific widget methods like insert() are standard for updates.

Answer

widget.rebind()

Answer

widget.reload()

Answer

widget.refresh()

Question 6

When creating a new project, how should you structure your imports?

Accepted Answer

Standard library imports, then third-party, then local, with blank lines between groups.. PEP 8 states that imports should be grouped into standard library imports, third-party imports, and local application imports.

Answer

In the order they are used in the file.

Answer

Alphabetically regardless of source.

Answer

All in a single line separated by semicolons.

Question 7

You need to add a label that displays static text in your GUI. Which widget is most appropriate for this purpose?

Accepted Answer

tk.Label(). The Label widget is designed specifically for displaying non-editable text or images.

Answer

tk.Message()

Answer

tk.Entry()

Answer

tk.Display()

Answer

tk.Text()

Question 8

When using the pack geometry manager, you want a widget to fill the available space in the parent container. Which argument for the 'fill' parameter should you use to make it expand in both horizontal and vertical directions?

Accepted Answer

fill=tk.BOTH. The 'BOTH' constant from the tkinter module is used with the fill parameter to expand in both dimensions.

Answer

fill='all'

Answer

fill='both'

Answer

fill=tk.EXPAND

Question 9

You need to ensure your code is readable by other Python developers. Which naming style should be used for variable names?

Accepted Answer

snake_case.. PEP 8 prescribes snake_case (lowercase with underscores) for variable and function names.

Answer

UPPER_SNAKE_CASE.

Answer

camelCase.

Answer

PascalCase.

Question 10

When documenting a complex function, which approach is most compliant with Google Style Python Docstrings regarding parameter types?

Accepted Answer

Use the 'Args:' section followed by the parameter name, type, and description.. Google Style requires explicit listing of types in the Args section to improve readability for static analysis tools.

Answer

Embed the types directly in the function name.

Answer

Include type hints in the docstring but omit them from the function signature.

Answer

Avoid documenting types to prevent redundancy with type hints.