modifying a list

letters = ["b", "l", "u", "e", "b", "i", "r", "d"]
for i in range(2, 7):
letters[i] = letters[i].upper()
print(letters)

a sequence of characters just like a list is a sequence of elements

Lists can contain anything, even a mix of different things, but strings only have characters

A character is a single letter, number, symbol, or blank

blanks: " " (space), "\t" (tab), "\n" (newline)

just like lists:

len returns the length

Can loop over characters with for

use in to check for containment

access individual characters with indexes

concatenate with +

unlike lists

fixed, cannot be modifed

immutable vs mutable, more detail next week

Python provides lots of useful operations