Computer Science: Python Programming Basics

What is the fundamental difference between a Python list and a Python tuple?

Lists are mutable, meaning their elements can be changed after creation, while tuples are immutable and cannot be modified once defined.

Explain the concept of 'dynamic typing' in Python.

Dynamic typing means that the type of a variable is determined at runtime based on the value assigned to it, rather than being explicitly declared by the programmer.

What does the string method .strip() accomplish?

The .strip() method removes all leading and trailing whitespace (including spaces, tabs, and newlines) from a string.

Describe the output of the range(start, stop, step) function.

It generates an immutable sequence of integers starting from 'start', incrementing by 'step', and ending just before 'stop' is reached.

What is the primary benefit of using the 'with' statement when opening files?

The 'with' statement acts as a context manager that ensures the file is properly closed automatically after the block finishes, even if an exception occurs.

What is the purpose of the __init__ method in a Python class?

The __init__ method is a constructor that initializes a new instance of a class by setting its initial state or attributes.

How do Python sets differ from lists regarding element uniqueness and ordering?

Sets are unordered collections that automatically enforce uniqueness, meaning they cannot contain duplicate elements, whereas lists maintain order and allow duplicates.

Explain the functionality of the .join() string method.

The .join() method takes an iterable (like a list) and concatenates its elements into a single string, using the string it was called on as the separator.

In a 'for' loop, when does the 'else' block execute?

The 'else' block executes only if the loop completes all its iterations naturally without being interrupted by a 'break' statement.

Write the general syntax for a list comprehension that includes a conditional filter.

[expression for item in iterable if condition]