PCPP1 Practice Test 15 — 15 Questions

Question 1

You are using the socket module to create a TCP client. After creating the socket object, which method call is required to establish a connection to a remote server listening on 192.168.1.50 at port 8080?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

sock.connect(('192.168.1.50', 8080)). For a TCP client socket, after creating the socket with socket.socket(socket.AF_INET, socket.SOCK_STREAM), the connect() method is what initiates the TCP three-way handshake with the remote server. Passing a tuple of (host, port) — here ('192.168.1.50', 8080) — tells the OS to open a connection to that endpoint. This is the client-side counterpart to the server's bind/listen/accept sequence.

Answer

sock.bind(('192.168.1.50', 8080))

Answer

sock.accept()

Answer

sock.listen(1)

Question 2

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

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type

Answer

handler_type

Question 3

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 specifies that imports should be grouped in the order: standard library, related third-party, then local application/library imports, with a blank line between each group. Within each group, imports should be sorted alphabetically. This convention makes dependencies explicit and helps detect circular imports early.

Answer

In the order they are used in the file.

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Alphabetically regardless of source.

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All in a single line separated by semicolons.

Question 4

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() is preferred over calling the parent class method directly because it correctly resolves the next method in the Method Resolution Order (MRO). This ensures that in multiple inheritance scenarios, all appropriate parent classes are called in the correct order, avoiding duplication or skipping.

Answer

It is required for private methods.

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It is faster.

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It makes the code more verbose.

Question 5

In the context of the Factory pattern in Python, what is a typical benefit of using a registry-based approach instead of a large if-else block?

Accepted Answer

It enables easy extension by adding new products without changing the factory.. A registry-based factory stores a mapping (typically a dict) from product identifiers to their concrete classes or creator callables, so the factory simply looks up and instantiates the requested product. Adding a new product means registering it in the mapping — no modification to the factory's control flow is required, satisfying the Open/Closed Principle. This decouples the factory from concrete product classes and makes extension a configuration concern rather than a code change.

Answer

It guarantees thread safety without locks.

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It prevents the instantiation of abstract classes.

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It significantly reduces memory usage.

Question 6

Why does the __init__ method not return anything?

Accepted Answer

Because it is designed to initialize an existing instance.. The __init__ method is for initialization only; the object creation is handled by __new__.

Answer

Because of internal Python constraints.

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To allow for multiple initialization.

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Because it's a generator.

Question 7

Which TWO of the following events are commonly bound in Tkinter for mouse interaction?

Accepted Answer

. In Tkinter, (option A) is a standard event that fires when the mouse pointer enters a widget, making it a common mouse-interaction binding. (option B) is also standard and fires when the left mouse button is pressed over a widget, so it is directly a mouse interaction event. By contrast, (option C) is not a Tkinter event at all; quitting is typically handled via protocols like WM_DELETE_WINDOW or a command callback. (option D) is a valid Tkinter event but it is a keyboard event, not a mouse event. (option E) is not a valid Tkinter event name; mouse motion is bound using (or for motion while the left button is held).

Answer

<Quit>

Answer

Answer

Question 8

Which TWO of the following are true regarding the HTTP 'User-Agent' header?

Accepted Answer

It can be spoofed to mimic browsers. Option B is correct because the User-Agent header is a plaintext, client-supplied string with no cryptographic protection or server-side verification, so tools like curl, browsers, or scripts can freely set it to any value (e.g., 'Mozilla/5.0') to impersonate another client. Option C is correct because the User-Agent header's defined purpose in HTTP is to identify the requesting user agent — the client application, its version, and often the OS — to the server, which may use it for content negotiation, analytics, or bot detection. Option A is wrong because encryption is provided by TLS/HTTPS, not by any HTTP header; User-Agent carries no cryptographic function. Option D is wrong because the socket module operates at the transport layer and has no knowledge of HTTP semantics; libraries like requests or http.client set User-Agent, not raw sockets. Option E is wrong because HTTP/1.1 only mandates the Host header for requests, and User-Agent is optional — many clients omit it or send an empty value.

Answer

It is used to encrypt the payload

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It is automatically set by the socket module

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It is mandatory for all HTTP requests

Question 9

You are investigating a network bottleneck in your Python application using `requests`. If you aren't using a `Session` object, what performance-related behavior should you expect?

Accepted Answer

Each request will perform a full TCP handshake. Without a Session, each request creates a new TCP connection, incurring the cost of a three-way handshake every time.

Answer

The application will use more memory

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Connection pooling will be enabled by default

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The server will block your IP immediately

Question 10

When using the 'socket' module, what is the effect of calling 'socket.settimeout(5.0)' on a socket object?

Accepted Answer

It causes the operation to raise a socket.timeout after 5 seconds. The settimeout() method sets a timeout in seconds for subsequent socket operations. If the operation does not complete within the time, a socket.timeout exception is raised.

Answer

It sets the send buffer size to 5.0 bytes

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It blocks the thread for exactly 5 seconds

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It forces the socket to close after 5 seconds of inactivity

Question 11

Which THREE of the following are valid ways to configure a widget's appearance after it has been created?

Accepted Answer

widget['bg'] = 'blue'. Option A, widget['bg'] = 'blue', is correct because Tkinter widgets implement the mapping protocol for configuration, so assigning to a widget's option key via item assignment updates that option just like a configuration call. Option B, widget.config(bg='blue'), is correct because config() is the standard Tkinter method for changing one or more widget options after creation, and bg is a valid option name. Option C, widget.configure(bg='blue'), is correct because configure() is simply the full-name alias of config() and performs the identical option-setting operation. Option D is not a valid Tkinter API, since there is no set_bg() method on widgets, and option E is incorrect because style is not a generic widget option that accepts a color string; styling is handled through ttk styles or specific options like bg.

Answer

widget.set_bg('blue')

Answer

widget.style = 'blue'

Question 12

Which TWO of the following are true about magic methods?

Accepted Answer

They provide hooks into Python language operators.. Option B is correct because magic methods (also called dunder methods) act as hooks that let user-defined classes integrate with Python's built-in syntax and operators — for example, __add__ is invoked by the + operator, __len__ by len(), and __iter__ by iteration. Option C is correct because magic methods are conventionally and syntactically named with a leading and trailing double underscore, such as __init__, __str__, or __eq__. Option A is wrong because magic methods are not limited to built-in types; user-defined classes can define and override them. Option D is wrong because magic methods can be overridden in subclasses or custom classes to customize behavior. Option E is wrong because magic methods are meant to be invoked implicitly by the interpreter through operators and built-in functions, not called directly by the user.

Answer

They are only available for built-in types.

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They cannot be overridden.

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They are intended for direct calling by the user.

Question 13

You are configuring a logging FileHandler. What does the 'mode' parameter control?

Accepted Answer

The file opening mode.. The 'mode' parameter controls the file opening mode (e.g., 'a' for append, 'w' for write).

Answer

The log format.

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The rotation interval.

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The character encoding.

Question 14

Which TWO of the following are valid ways to terminate a Tkinter script gracefully?

Accepted Answer

root.quit(). Option B, root.quit(), is correct because it tells the Tkinter mainloop to stop processing events and return control to the code after mainloop(), which is the standard graceful way to end the event loop while allowing cleanup code to run. Option E, root.destroy(), is also correct because it destroys the root window and all its child widgets, causing the mainloop to exit and the application to terminate cleanly. Option A, os.kill(), is not appropriate because it sends a low-level signal to a process (e.g., SIGTERM/SIGKILL) rather than performing a Tkinter-aware shutdown, so it bypasses widget cleanup. Option C, exit(), is not a Tkinter method and is intended for interactive interpreters; calling it in a GUI script raises SystemExit abruptly rather than gracefully stopping the Tk mainloop. Option D, root.close(), is invalid because Tkinter's Tk root object has no close() method; the correct window-closing method is destroy().

Answer

os.kill()

Answer

exit()

Answer

root.close()

Question 15

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.

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By raising a warning if called externally.

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By adding a comment like '# INTERNAL'.

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By using all caps.

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By suffixing with an underscore.