PCPP1 Practice Test 4 — 25 Questions

Question 1

When using configparser, how do you handle multiline values?

Accepted Answer

Indent the subsequent lines.. You indent lines following the initial line within the option.

Answer

Use a backslash at the end of each line.

Answer

Wrap them in triple quotes ('''...''').

Answer

Use the '
' escape character.

Question 2

You are using sqlite3 and need to enforce foreign key constraints. How do you enable them?

Accepted Answer

connection.execute('PRAGMA foreign_keys = ON'). You must execute the command 'PRAGMA foreign_keys = ON;' on the connection.

Answer

It is enabled by default.

Answer

connection.execute('SET FOREIGN_KEYS ON')

Answer

connection.enable_foreign_keys()

Question 3

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 4

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)

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params=payload

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body=payload

Question 5

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 6

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 7

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 8

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 9

What is the primary difference between the 'socket.AF_INET' and 'socket.AF_INET6' address families?

Accepted Answer

AF_INET is for IPv4; AF_INET6 is for IPv6. AF_INET is for IPv4, while AF_INET6 is for IPv6 addressing.

Answer

AF_INET6 supports UDP only

Answer

AF_INET requires a password

Answer

AF_INET is faster than AF_INET6

Question 10

You need to configure the logging module to capture logs from multiple modules while ensuring that logs from third-party libraries (e.g., 'urllib3') are only captured at the WARNING level. How do you set this?

Accepted Answer

logging.getLogger('urllib3').setLevel(logging.WARNING). You can configure individual loggers using getLogger() and setting their specific level attribute.

Answer

logging.config.dictConfig({'urllib3': 'WARNING'})

Answer

logging.basicConfig(level=logging.WARNING)

Answer

logging.setLevel('urllib3', logging.WARNING)

Question 11

What is the purpose of the 'socket.shutdown()' method in Python?

Accepted Answer

It stops further communication on the socket. shutdown() allows you to stop sending or receiving data on a socket while keeping the file descriptor open.

Answer

It forces the socket to release its memory

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It resets the socket connection immediately

Answer

It closes the file descriptor completely

Question 12

You are using configparser and want to access a value that might not exist, but provide a default value if it is missing. Which method is most appropriate?

Accepted Answer

parser.get('section', 'option', fallback='val'). The get() method accepts a 'fallback' argument to return a default value if the option is missing.

Answer

parser.get('section', 'option', default='val')

Answer

parser.get_or_default('section', 'option', 'val')

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parser.exists('section', 'option') ? ...

Answer

parser.get('section', 'option') or 'val'

Question 13

When using configparser, what happens if you attempt to read a configuration file that does not exist using the read() method?

Accepted Answer

It returns an empty list.. The read() method returns an empty list and does not raise an exception.

Answer

It raises a FileNotFoundError.

Answer

It raises a configparser.Error.

Answer

It creates an empty configuration object.

Question 14

Which widget is most appropriate for displaying a list of selectable items?

Accepted Answer

tk.Listbox(). The Listbox widget is intended for displaying a list of strings that the user can select.

Answer

tk.Checkbutton()

Answer

tk.OptionMenu()

Answer

tk.Menu()

Question 15

When implementing a timeout in 'requests.get()', what is the consequence of setting it as a single float (e.g., timeout=5)?

Accepted Answer

It limits both the connection and read time to 5 seconds. Providing a single value sets both the connect and read timeouts to that value.

Answer

It only limits the read phase

Answer

It causes an error because a tuple is expected

Answer

It only limits the connection phase

Question 16

You are debugging a legacy application and need to ensure that resources like file handles are always closed. Which construct is preferred?

Accepted Answer

Use a context manager with the 'with' statement.. The 'with' statement invokes a context manager, which guarantees that the __exit__ method runs and closes the file handle even if an exception occurs inside the block. This is the idiomatic, preferred Python construct for deterministic resource cleanup. It is cleaner and safer than manual try/finally code.

Answer

Wrap the file operation in a try-except block.

Answer

Manually call file.close() in a finally block.

Answer

Rely on the garbage collector to close the handle.

Question 17

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

Accepted Answer

pack. Option A, pack, is a valid Tkinter geometry manager that organizes widgets by packing them against the edges of their parent container in the order they are added. Option E, grid, is also a valid Tkinter geometry manager that places widgets in a two-dimensional table of rows and columns using row and column indices. The other options do not belong: block, align, and flow are not Tkinter geometry managers; Tkinter's third standard geometry manager is place, which is not listed here.

Answer

block

Answer

align

Answer

flow

Question 18

Which TWO of the following are correct regarding the 'with' statement in Python?

Accepted Answer

It requires the class to define __enter__ and __exit__.. Option D is correct because the context manager protocol requires the object used in a 'with' statement to implement the special methods __enter__() (which runs on entry and may return a value bound via 'as') and __exit__() (which runs on exit and receives exception type, value, and traceback). Option E is correct because the 'with' statement is semantically equivalent to a try/finally block, so __exit__() is invoked whether the block completes normally or raises an exception, ensuring cleanup such as closing files or releasing locks. Option A is wrong because 'with' does not rely on __init__; initialization happens when the object is constructed, not when the context is entered. Option B is wrong because 'with' is not limited to file objects; any object implementing the context manager protocol works, including locks, sockets, and database connections. Option C is wrong as stated because not every object supports the protocol — only those defining __enter__ and __exit__ can be used directly in a 'with' statement.

Answer

It works by implicit __init__ calling.

Answer

It only works with file objects.

Answer

It can be used with any object.

Question 19

Why might you use the __init_subclass__ hook instead of a metaclass?

Accepted Answer

It is easier to implement and avoids metaclass conflicts.. __init_subclass__ provides a simpler way to perform logic when a subclass is created, without the complexity and inheritance issues associated with custom metaclasses.

Answer

Metaclasses are deprecated.

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Metaclasses cannot be used for registration.

Answer

It is faster at runtime.

Question 20

Which TWO of the following are true about the sqlite3.Cursor object?

Accepted Answer

It can be used as an iterator to fetch rows.. Option A is correct because a sqlite3.Cursor implements the iterator protocol, so you can loop over it directly (e.g., 'for row in cursor:') to fetch rows one at a time from the result set. Option B is correct because the Cursor object provides the execute(), executemany(), and executescript() methods that are used to run SQL statements against the database. Option C is incorrect because transaction handling is a property of the Connection object, not the Cursor; SELECT statements do not automatically open a transaction in the way described. Option D is incorrect because a single Cursor can be reused for multiple sequential queries, and multiple cursors can exist on one connection. Option E is incorrect because connection state (such as open/closed status and transaction control) is tracked by the sqlite3.Connection object, not the Cursor.

Answer

It automatically creates a transaction for every SELECT.

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It is limited to one active query.

Answer

It keeps track of the connection state.