Lists

25 min In Progress

Learning Objectives

  • Create and modify lists
  • Use indexing and slicing
  • Apply common list methods

Creating Lists

A list is an ordered, mutable collection of items.

fruits = ["apple", "banana", "cherry"]
mixed = [1, "two", 3.0, True]
print(fruits[0])   # first item
print(fruits[-1])  # last item

List Methods

Lists have powerful built-in methods for manipulation.

animals = []
animals.append("Lion")
animals.append("Zebra")
animals.insert(1, "Elephant")
animals.remove("Zebra")
print(animals)
print(len(animals))

Slicing

Extract portions of a list with start:stop:step syntax.

nums = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
print(nums[2:5])
print(nums[:3])
print(nums[::2])
print(nums[::-1])

Course Example: List Operations

A walkthrough of common list operations from your course.

wild = ["Lion", "Zebra", "Panther", "Antelope"]
wild.append("Elephant")
animals = []
animals.extend(wild)
animals.insert(2, "Cheetah")
animals.pop(1)
animals.insert(1, "Giraffe")
animals.sort(key=None, reverse=False)
print(animals)

📝 Exercise: Shopping List Manager

Create a shopping list, add three items, remove one, sort it, and print the result.

code.py
Output

            

        

    


    

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