PCPP1 Practice Test 13 — 15 Questions

Question 1

You are processing a CSV file using csv.DictReader. If your input file lacks a header row, how do you provide the field names?

Accepted Answer

csv.DictReader(f, fieldnames=['a', 'b']). You pass the 'fieldnames' argument to the constructor to define the headers explicitly.

Answer

csv.DictReader(f, headers=['a', 'b'])

Answer

csv.DictReader(f).map(['a', 'b'])

Answer

csv.DictReader(f, columns=['a', 'b'])

Question 2

Which class in xml.etree.ElementTree should you use to parse an XML file from a file object?

Accepted Answer

ElementTree.parse(). The parse() function is the standard way to read XML from a file object.

Answer

ElementTree.XML()

Answer

ElementTree.load()

Answer

ElementTree.read()

Question 3

Which logging configuration would effectively suppress all log messages?

Accepted Answer

logging.disable(logging.CRITICAL + 1). Setting the level to logging.CRITICAL + 1 (or any value higher than the highest defined level) suppresses all logs.

Answer

logging.basicConfig(level=0)

Answer

logging.disable(logging.CRITICAL)

Answer

logging.getLogger().setLevel(logging.NOTSET)

Question 4

Which widget is most appropriate if you need to display a read-only multi-line block of text to the user?

Accepted Answer

Text. The Text widget is standard for multi-line text, and setting 'state' to 'disabled' makes it read-only.

Answer

difficulty

Answer

Message

Answer

Entry

Answer

Label

Question 5

What is the consequence of not calling super().__init__() in a class with multiple inheritance?

Accepted Answer

The initialization chain for parent classes is interrupted.. The MRO chain will break, and sibling classes may not be initialized properly, potentially causing missing attributes or logic errors.

Answer

The class will not be created.

Answer

All attributes will be lost.

Answer

Python will raise a RuntimeError.

Question 6

Which of the following headers is commonly used in REST APIs to indicate the format of the request body?

Accepted Answer

Content-Type. The 'Content-Type' header tells the server what type of media is being sent in the request body.

Answer

Authorization

Answer

Accept

Answer

User-Agent

Question 7

When receiving data from a TCP socket using 'recv(buffer_size)', what does the returned value represent?

Accepted Answer

The data as a byte string. The method returns the bytes received, up to the specified buffer size.

Answer

A boolean indicating connection status

Answer

The total number of bytes in the stream

Answer

The number of packets received

Question 8

Which THREE of the following are valid parameters for the pack() layout manager?

Accepted Answer

expand. side, fill, and expand are standard parameters for the pack() manager.

Answer

row

Answer

column

Question 9

Which THREE of the following statements are correct about Python metaclasses?

Accepted Answer

They are instances of 'type'.. Metaclasses create classes, they can be inherited, and they can be used for automatic registration.

Answer

They are strictly for private attribute management.

Answer

They only apply to the class itself, not its subclasses.

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

Answer

It blocks the thread for exactly 5 seconds

Answer

It forces the socket to close after 5 seconds of inactivity

Question 11

When sending a JSON payload with 'requests.post()', which argument should you use to automatically set the 'Content-Type' to 'application/json'?

Accepted Answer

json=payload. The 'json' argument automatically serializes the data and sets the correct headers.

Answer

data=json.dumps(payload)

Answer

params=payload

Answer

body=payload

Question 12

Which TWO of the following exceptions might be raised during socket operations?

Accepted Answer

TimeoutError. ConnectionRefusedError and TimeoutError are standard exceptions in network programming when connections fail.

Answer

ImportError

Answer

ValueError

Answer

KeyError

Question 13

You are implementing a GUI where a long-running calculation is performed upon clicking a button. To prevent the GUI from freezing (not responding), what is the best practice approach?

Accepted Answer

Use the threading module to run the calculation in a separate thread.. Running blocking operations in the main thread freezes the event loop; threading is required to keep the GUI responsive.

Answer

Call root.update() inside the calculation loop.

Answer

Increase the root.after() delay time.

Answer

Wrap the calculation in a try-except block within the button command.

Answer

difficulty

Question 14

What is the primary risk of using 'getattr' without a default value?

Accepted Answer

It raises an AttributeError.. If the attribute is not found, it raises an AttributeError, potentially crashing the application if not handled.

Answer

It returns None.

Answer

It enters an infinite loop.

Answer

It creates the attribute.

Question 15

You are using 'concurrent.futures.ThreadPoolExecutor' to fetch data from multiple REST APIs. What happens if an exception is raised inside a thread?

Accepted Answer

The exception is stored and raised when calling future.result(). Exceptions raised in a future are captured and re-raised when calling result() on the Future object returned by submit().

Answer

The exception is ignored by the ThreadPoolExecutor

Answer

The entire program crashes immediately

Answer

The thread dies silently without notification