PCPP2 Practice Test 8 — 10 Questions

Question 1

You are using a multiprocessing.Semaphore(3). What happens when the 4th process attempts to acquire the semaphore?

Accepted Answer

It blocks until a slot is released.. The 4th process will block until one of the previous three processes releases the semaphore.

Answer

It creates a new process slot.

Answer

It raises an exception.

Answer

It bypasses the lock.

Answer

It is terminated by the OS.

Question 2

Which THREE of the following are standard ways to implement the 'Strategy' pattern in Python?

Accepted Answer

Injecting the strategy instance at runtime. Using functions, classes, or dependency injection are all valid strategies.

Answer

Hardcoding the strategy selection logic in the context

Answer

Using a global variable to change strategy behavior

Question 3

What is the result of using 'unittest.mock.patch.object' instead of 'unittest.mock.patch'?

Accepted Answer

It targets an attribute on an object instance.. patch.object is used to patch a specific attribute on an object, rather than patching an object by its string path.

Answer

It is faster.

Answer

It requires less memory.

Answer

It cannot be used with context managers.

Question 4

Which TWO of the following are valid ways to run tests?

Accepted Answer

python -m unittest. Both 'pytest' and 'python -m unittest' are the standard command-line ways to execute Python test suites.

Answer

unittest.execute()

Answer

python run_tests.py

Answer

import pytest; pytest.run()

Question 5

You are building an application using SSL/TLS. Which module must be used to wrap a standard socket to provide encrypted communication?

Accepted Answer

ssl. The ssl module provides the necessary wrappers to enable TLS/SSL over standard socket objects.

Answer

cryptography

Answer

hashlib

Answer

socket.ssl

Question 6

You are implementing a custom type in SQLAlchemy. Which method must be overridden to convert data from the database type back to a Python object?

Accepted Answer

process_result_value. The process_result_value method is responsible for type conversion during retrieval.

Answer

load_dialect_impl

Answer

bind_processor

Answer

process_bind_param

Question 7

Which TWO are common methods to handle BSON Date objects in PyMongo?

Accepted Answer

Using standard Python datetime objects. datetime.datetime objects are automatically converted to BSON Dates.

Answer

Using bson.datetime.Datetime

Answer

Using the 'timestamp' helper method

Answer

Using ISODate strings

Question 8

You are using the subprocess.run() function to execute an external command. Which argument ensures that the command's stdout is captured as a string rather than printed to the console?

Accepted Answer

capture_output=True. Setting capture_output=True automatically sets stdout and stderr to subprocess.PIPE.

Answer

text=True

Answer

stdout=True

Answer

shell=True

Answer

pipe=True

Answer

redirect=True

Question 9

When optimizing Python code, which tool should you use to identify hot spots in the execution path?

Accepted Answer

cProfile. cProfile is the standard built-in profiler in Python for identifying performance bottlenecks.

Answer

pydoc

Answer

pdb

Answer

unittest

Question 10

You are using sqlite3 in Python and need to ensure that data integrity is maintained when performing multiple related INSERT operations. Which method should you call on the connection object to commit your changes?

Accepted Answer

connection.commit(). The commit() method is used to save the current transaction to the database.

Answer

connection.save()

Answer

connection.flush()

Answer

cursor.apply()