What are Python comprehensions and how do they work?

What are Python comprehensions and how do they work?

Python comprehensions are concise ways to create lists, dictionaries, or sets. They allow you to generate these collections in a single line of code.

Can you give me an example of a list comprehension?

Sure! A simple list comprehension to create a list of squares of numbers from 0 to 9 would be: [x**2 for x in range(10)].

What about dictionary comprehensions?

Dictionary comprehensions work similarly. For example: {x: x**2 for x in range(5)} creates a dictionary of numbers and their squares.

Are there any performance benefits to using comprehensions?

Yes, comprehensions are generally faster than using loops because they are optimized for performance in Python.