D522 Python for IT Automation - Set 3 - Part 2

Correct Answer: class ClassName:

A class is defined with the class keyword followed by the name and a colon: class ClassName:

Correct Answer: __init__

The __init__ method is the constructor called when a new instance of a class is created.

Correct Answer: The current instance of the class

self refers to the specific instance the method is being called on, giving access to its attributes.

Correct Answer: Server()

Calling the class like a function, Server(), creates a new instance and runs its __init__ method.

Correct Answer: A file containing reusable Python code

A module is a .py file containing definitions and code that can be imported and reused in other programs.

Correct Answer: from time import sleep

from time import sleep imports just the sleep function so it can be called directly without the module prefix.

Correct Answer: Runs code only when the file is executed directly, not imported

This idiom ensures certain code runs only when the script is executed directly, not when it is imported as a module.

Correct Answer: yield

A generator uses yield to produce a series of values one at a time, pausing between them to save memory.

Correct Answer: It produces values on demand, using less memory

A generator yields values lazily, avoiding the memory cost of building an entire list, which matters for large data streams.

Correct Answer: Both the index and the value of each item

enumerate() yields pairs of (index, item) while iterating, avoiding manual counter management.

Correct Answer: Combines multiple iterables element by element into tuples

zip() pairs up corresponding elements from multiple iterables into tuples, useful for iterating in parallel.

Correct Answer: A variable number of positional arguments

*args lets a function accept any number of positional arguments, gathered into a tuple.

Correct Answer: A variable number of keyword arguments

**kwargs lets a function accept arbitrary keyword arguments, collected into a dictionary.

Correct Answer: A value used when the caller omits that argument

A default parameter value is used automatically when the caller does not supply that argument, such as def f(x=10).

Correct Answer: keys()

The keys() method returns a view of all the keys in a dictionary.

Correct Answer: values()

The values() method returns a view of all the values stored in a dictionary.

Correct Answer: items()

The items() method returns a view of (key, value) tuples, commonly used when looping over a dictionary.

Correct Answer: get()

The get() method returns the value for a key, or a specified default (None if unspecified) when the key is absent, avoiding a KeyError.

Correct Answer: Whether a value is a member of the list

The in operator returns True if the specified value is present in the list or other sequence.

Correct Answer: Acts as a placeholder that does nothing

pass is a null operation used as a placeholder where syntax requires a statement but no action is needed.