A set is a collection of distinct elements, that is, each element is unique. Searching over sets is very fast and they can be used to find the unique items in a collection.

Cell 1:

cat_names = {"Kitty", "Garfield", "Horse"}

dog_names = {"Fido", "Odie", "Satchel"}

pet_names = cat_names|dog_names # the union of the two sets

print("pet_names = ", pet_names)

canine_names = pet_names - cat_names # the difference of the two sets

print("canine_names = ", canine_names)

Cell 2:

list1 = list(range(1,11)) # list1 is a list

print("list 1 = ", list1)

set1 = set(list1) # cast list1 as a set

print("set 1 = ", set1)

set2 = set() # empty set

for i in range(6, 16):

set2.add(i)

print("set 2 = ", set2)

set3 = set1|set2

print("set 3 = ", set3)

6 in set3

# In the code cells above that were used to perform the word count, bookcontents is a variable that stores all of

# the words in the book as a list. Enter Python code below to find the length of the list. (How many words are in the book?)

# Cast bookcontents as a set and find the length of the set. (How many unique words are in the book?)