Lists and Dictionaries

Lists

Create a list

people = [] # empty list
animals = ['daisy','pat','wabbit','bunny']

Access elements

print(animals[0]) # first item
print(animals[-1]) # last item
print(animals[-2]) # penultimate item
print(f"{animals[0].title()} is a cow.") # in an f-string

Modify, add, insert elements

animals[3] = 'veau' # replace item 3
animals.append('croc') # add new item to end of list
animals.insert(1,'pato') # insert item at index 1

Remove elements

del animals[0] # delete item at index 0
popped_animal = animals.pop() # remove last item
popped_animal = animals.pop(2) # remove item at index 2
animals.remove('veau') # remove (first instance of) item by value

Organize Lists

animals.sort() # sort values a-z
animals.sort(reverse=True) # sort values z-a
animals.reverse() # reverse order (not z-a)
print(sorted(animals)) # temporarily sort
len(animals) # returns number of items