Lists — Python's Workhorse Data Structure

Lists are ordered, mutable sequences. Can hold mixed types.

fruits = ["apple", "banana", "cherry"]
numbers = [1, 2, 3, 4, 5]
mixed = [1, "hello", True, 3.14]

Accessing elements:

fruits[0]    # "apple"
fruits[-1]   # "cherry"
fruits[1:3]  # ["banana", "cherry"]

Modifying lists:

fruits.append("date")        # add to end
fruits.insert(1, "avocado") # insert at index
fruits.remove("banana")     # remove by value
fruits.pop()                # remove last
fruits.pop(0)               # remove by index
fruits.sort()               # sort in place
len(fruits)                 # length

List comprehension (Pythonic):

squares = [x**2 for x in range(10)]
evens = [x for x in range(20) if x % 2 == 0]

Common trap: list2 = list1 does NOT copy — both point to the same list. Use list2 = list1.copy() or list2 = list1[:].

Reference:

Wikipedia: List

https://en.wikipedia.org/wiki/List_(abstract_data_type)