PCPP1 Practice Test 9 — 10 Questions

Question 1

Which THREE of the following widgets are part of the 'ttk' (Themed Tkinter) module?

Accepted Answer

ttk.Entry. ttk.Button, ttk.Label, and ttk.Entry are part of the themed widget set, whereas standard tkinter widgets are in the top-level tkinter module.

Answer

ttk.Window

Answer

ttk.Canvas

Question 2

You want to create a Menu that contains sub-menus. Which class or method is used to add a sub-menu to an existing menu?

Accepted Answer

menu.add_cascade(). The add_cascade method is used to create a menu item that opens a sub-menu.

Answer

difficulty

Answer

menu.add_menu()

Answer

menu.add_command()

Answer

menu.add_submenu()

Question 3

In the context of the Descriptor Protocol, what is the primary difference between a data descriptor and a non-data descriptor?

Accepted Answer

Data descriptors define __set__ or __delete__, whereas non-data descriptors do not.. A data descriptor defines both __get__ and __set__ (or __delete__), while a non-data descriptor only defines __get__.

Answer

Non-data descriptors can override instance dictionary lookup.

Answer

Data descriptors only function with class attributes.

Answer

Non-data descriptors are always read-only.

Question 4

Which magic method should you implement to make your objects support the 'with' statement context manager?

Accepted Answer

__enter__ and __exit__. The __enter__ and __exit__ methods are required to implement the context manager protocol.

Answer

__context__

Answer

__open__ and __close__

Answer

__init__ and __del__

Question 5

In the context of the Observer pattern, what is the benefit of an event-driven system over a direct-method-call approach?

Accepted Answer

Decoupling between the subject and observers.. Decoupling is the primary benefit; the subject does not need to know the implementation details of the observers.

Answer

Reduced memory usage.

Answer

Increased performance.

Answer

Automatic thread synchronization.

Question 6

Which THREE of the following are true about the Python descriptor protocol?

Accepted Answer

They must be defined in the class body.. Descriptors allow you to manage attribute access, they have specific lookup order, and they are used by property/classmethod internally.

Answer

Non-data descriptors can define __set__.

Answer

They only work for instance attributes.

Question 7

You are configuring logging using a dictConfig. You want to send logs to a RotatingFileHandler. Which key must you define in the 'handlers' section?

Accepted Answer

class. The 'class' key is required to specify the handler type, e.g., 'logging.handlers.RotatingFileHandler'.

Answer

destination

Answer

type

Answer

handler_type

Question 8

When designing a public API, how should you signal that a method is for internal use only?

Accepted Answer

By prepending a single underscore.. Prefixing a name with a single underscore is the conventional way to indicate internal use.

Answer

By raising a warning if called externally.

Answer

By adding a comment like '# INTERNAL'.

Answer

By using all caps.

Answer

By suffixing with an underscore.

Question 9

Which comment style is preferred for block comments in Python?

Accepted Answer

Each line starting with a single '#' and a space.. Block comments should consist of paragraphs of text, each starting with a # and a single space.

Answer

Using a string literal (triple quotes) at the top level.

Answer

Using block comments inside a single line.

Answer

Using a single '#' at the end of every line.

Question 10

Which TWO practices help maintain clean code when using Python's 'try-except' blocks?

Accepted Answer

Keep the 'try' block as small as possible.. Keep the try block small and catch specific exceptions.

Answer

Use a single 'except:' clause for the whole project.

Answer

Always ignore errors in the 'except' block.

Answer

Put as much code as possible in the 'try' block.