8.1 Lists and Indexing

Notes

A list stores an ordered collection of values in square brackets. Each item has an index starting at 0.

colors = ["red", "green", "blue"]
print(colors[0])
print(colors[-1])
print(len(colors))

• This prints red, then blue, then 3.
• colors[1] = "pink" changes an item: lists are mutable.
• Going past the end (like colors[3]) causes an IndexError.
• A slice colors[0:2] gives ["red", "green"] and stops before index 2.