Python Modules and Packages 2

Question 1

What does the `__all__` variable in a module control?

Accepted Answer

Which names are exported when `from module import *` is used

Answer

Which functions are automatically called on import

Answer

The order in which module attributes are loaded

Answer

Which names are visible in `dir(module)`

Question 2

Which file must exist in a directory for Python 2 to treat it as a package?

Accepted Answer

__init__.py

Answer

setup.py

Answer

package.py

Answer

__main__.py

Question 3

What is a 'namespace package' in Python 3?

Accepted Answer

A package spread across multiple directories without an `__init__.py`

Answer

A package that only exports names listed in `__all__`

Answer

A package installed in a virtual environment

Answer

A package with a custom `__namespace__` attribute

Question 4

What does `importlib.reload(module)` do?

Accepted Answer

Re-executes the module's code in the existing module object

Answer

Creates a new module object and replaces the old one

Answer

Deletes and reimports the module from scratch

Answer

Clears the module's `__dict__` without re-executing code

Question 5

What is the purpose of `sys.path`?

Accepted Answer

It is a list of directories Python searches when importing modules

Answer

It stores the path to the Python executable

Answer

It defines the current working directory

Answer

It lists installed packages and their versions

Question 6

Which statement correctly imports only the `sqrt` function from the `math` module?

Accepted Answer

from math import sqrt

Answer

import math.sqrt

Answer

import sqrt from math

Answer

include math.sqrt

Question 7

What value does `__name__` hold when a module is imported (not run directly)?

Accepted Answer

The module's fully qualified name

Answer

'__main__'

Answer

None

Answer

The filename without extension