w6

Question 1

how to see if something is in a set

Answer 1

“in” operator

Question 2

farm_animals.add(cow)

Answer 2

inserts cow into set

Question 3

farm_animals.remove(cow)

Answer 3

removes cow from set

Question 4

farm_animals.clear()

Answer 4

clear method empties set

Question 5

print(pets | farm_animals)

Answer 5

creates a new set with both obj and arg

Question 6

print(pets & farm_animals)

Answer 6

creates a new set containing items common to both

Question 7

print(pets - farm_animals)

Answer 7

creates a new set containing items common to obj but not in arg

Question 8

print(pets ^ farm_animals)

Answer 8

symmetric diff - creates a set with items in one set or the other but not in both

Question 9

my_pets<=pets

Answer 9

is subset - are “my_pets” set in “pets” set

Question 10

pets>=my_pets

Answer 10

is superset - does pets contain all of my pets

Question 11

2 components of dictionaries

Answer 11

key and value pairs

Question 12

3 characteristics of keys

Answer 12

unordered, any key can appear only once, are immutable

Question 13

what does {} by itself mean

Answer 13

empty dictionary

Question 14

how to clear dictionary

Answer 14

d.clear()

Question 15

fruit_counts.get(‘apple’)

Answer 15

returns value associated with apple

Question 16

fruit_counts.pop(‘apple’)

Answer 16

deletes key and its value

Question 17

fruit_counts[‘mango’] = 42

Answer 17

adding the key mango with a value of 42

Question 18

fruit_counts.keys()

Answer 18

returns a list-like object of dictionaries keys

Question 19

fruit_counts.items()

Answer 19

returns a list-like object of dictionaries keys and values

Question 20

fruit_counts.values()

Answer 20

returns a list-like object of dictionaries values

Question 21

fruit_counts.update()

Answer 21

adds a set of key/value pairs or even another dictionary