16 mins

Screencasts: Comprehensions in Python

In Python it's very common to build up new lists while looping over old lists. Partly this is because we don't mutate lists very often while looping over them.

Because we build up new lists from old ones so often, Python has a special syntax to help us with this very common operation: list comprehensions.

List comprehensions in Python
02:24
Turning a for loop into a list comprehension
04:28
Why use a list comprehension?
02:31
Set and dictionary comprehensions
03:19
When should you not use a list comprehension?
03:14
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