PCAP Multiple Select — 10 Questions

Question 1

Which THREE of the following are valid ways to import a function named 'calculate' from a module named 'math_ops' located in a subpackage 'operations' of a package 'app'?

Accepted Answer

from app.operations.math_ops import calculate. It uses the standard Python import syntax to directly import the 'calculate' function from the 'math_ops' module, which is located in the 'operations' subpackage of the 'app' package. This is the most straightforward and recommended way to import a specific attribute from a module.

Answer

import app.operations.math_ops.calculate

Answer

from app.import operations.math_ops import calculate

Question 2

Which THREE of the following statements about Python's 'with' statement are true? (Select exactly 3)

Accepted Answer

It can be used with any object that implements __enter__ and __exit__ methods.. Option A is correct because the context manager protocol is defined precisely by the presence of __enter__ and __exit__ methods, so any object implementing both can be used with 'with'. Option B is correct because the 'with' statement's semantics ensure __exit__ is invoked when the block exits, whether normally or via an exception, which is the core guarantee of the protocol. Option C is correct because Python supports 'with A() as a, B() as b:' syntax, allowing multiple context managers separated by commas (equivalent to nested with statements). Option D is not marked correct because while 'with' often replaces try/finally for resource cleanup, it does not eliminate the need for try/finally in all cases, such as when no context manager exists or when cleanup logic must run without one. Option E is not marked correct because 'with' works with any context manager, not only file objects; files are just a common example.

Answer

It eliminates the need for try/finally blocks for resource management.

Answer

It can only be used with file objects.

Question 3

Which TWO of the following statements about Python's `sys.path` are true?

Accepted Answer

Module search stops at the first matching directory in `sys.path`.. Python's import mechanism iterates through `sys.path` in order and stops at the first directory containing the requested module. Option E is correct: the directory containing the script (or the current directory when running interactively) is inserted at the beginning of `sys.path` at startup. Options A, C, and D are false: the current working directory is not always first (the script's directory takes precedence), `sys.path` is initialized from the `PYTHONPATH` environment variable *in addition to* default paths, and `sys.path` is a list, not a tuple. Therefore, only two statements are true.

Answer

The current working directory is always the first element in `sys.path`.

Answer

`sys.path` is initialized from the PYTHONPATH environment variable.

Answer

`sys.path` is a tuple of strings.

Question 4

Which THREE factors can cause an 'ImportError' when trying to import a module?

Accepted Answer

The module is a C extension that fails to load.. If a module is a C extension (e.g., a .so or .pyd file) and it fails to load due to missing dependencies, incompatible architecture, or a linking error, Python raises an ImportError. This is distinct from a syntax error in Python source code, which would raise a SyntaxError, not an ImportError.

Answer

The module file has a syntax error.

Answer

The module's __init__.py is empty.

Question 5

Which TWO statements about Python strings are correct? (Choose exactly 2 correct answers.)

Accepted Answer

Strings are immutable; operations like concatenation produce a new string.. Python strings are immutable, meaning once a string object is created, its content cannot be changed. Any operation that appears to modify a string, such as concatenation with the + operator, actually creates a brand-new string object in memory, leaving the original unchanged.

Answer

Strings are mutable; you can change individual characters via indexing.

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Strings have an .append() method to add characters at the end.

Answer

You can assign a new character to a position in a string using indexing: s[0] = 'a'.

Question 6

Which of the following statements about class inheritance in Python are true? (Choose two.)

Accepted Answer

Abstract base classes can be defined using the ABC module.. Python's `abc` module (Abstract Base Classes) allows you to define abstract base classes by inheriting from `ABC` and using the `@abstractmethod` decorator. This enforces that subclasses must implement the abstract methods, providing a formal interface contract.

Answer

A class can inherit from only one base class.

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A child class can override any method from its parent class, but only if the method is declared as virtual.

Answer

The super() function is used to call a method from a sibling class.

Question 7

Which TWO statements are true regarding strings in Python?

Accepted Answer

Strings can be concatenated with the + operator.. Strings in Python support concatenation using the + operator, which joins two or more strings into a single string. This is a fundamental operation for combining textual data, and it works by creating a new string object that contains the characters from both operands in sequence.

Answer

Strings are not sequences.

Answer

Strings are mutable.

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Strings do not support indexing.

Question 8

Which TWO of the following are correct ways to raise a custom exception in Python? (Assume CustomError and CustomException are user-defined.)

Accepted Answer

raise CustomError("invalid"). It raises a user-defined exception by instantiating the custom exception class `CustomError` with an argument (the string "invalid"). In Python, the `raise` statement must be followed by an exception instance or an exception class; `CustomError("invalid")` creates an instance of the custom exception, which is the proper way to raise a custom exception with a custom message.

Answer

raise "Custom error"

Answer

raise 42

Answer

raise Exception

Question 9

Which TWO of the following are valid uses for the '__name__' variable in a Python module?

Accepted Answer

To check if the module is being run as the main program.. The '__name__' variable is set to the string '__main__' when the module is executed directly as the main program (e.g., via 'python module.py'). This allows a module to include code that runs only when it is the entry point, not when it is imported by another module. The check is typically done with 'if __name__ == "__main__":'.

Answer

To get the file path of the module.

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To control which names are exported when using 'from module import *'.

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To determine which module imported it.

Question 10

Which TWO of the following are appropriate techniques for logging exception details in Python? (Select exactly 2)

Accepted Answer

Using traceback.format_exc(). `traceback.format_exc()` returns the full traceback as a string, which can be logged or printed to capture detailed exception context. Option E is correct because `logging.exception()` automatically includes the traceback of the current exception when called inside an `except` block, making it the idiomatic way to log exceptions in Python.

Answer

Using print(e.args)

Answer

Using sys.exc_info()

Answer

Using raise without argument