12. The email_list function receives a dictionary, which contains domain names as keys, and a list of users as values. Fill in the blanks to generate a list that contains complete email addresses (e.g. diana.prince@gmail.com).
def email_list(domains): emails = [] for ___: for user in users: emails.___ return(emails)
print(email_list({"gmail.com": ["clark.kent", "diana.prince", "peter.parker"], "yahoo.com": ["barbara.gordon", "jean.grey"], "hotmail.com": ["bruce.wayne"]}))
def email_list(domains):
emails = []
for ___:
for user in users:
emails.___
return(emails)
def email_list(domains):
emails = []
for domain, users in domains.items():
for user in users:
emails.append(user + “@” + domain)
return(emails)
print(email_list({“gmail.com”: [“clark.kent”, “diana.prince”, “peter.parker”], “yahoo.com”: [“barbara.gordon”, “jean.grey”], “hotmail.com”: [“bruce.wayne”]}))
13. The groups_per_user function receives a dictionary, which contains group names with the list of users. Users can belong to multiple groups. Fill in the blanks to return a dictionary with the users as keys and a list of their groups as values.
def groups_per_user(group_dictionary): user_groups = {} # Go through group_dictionary for ___: # Now go through the users in the group for ___: # Now add the group to the the list of# groups for this user, creating the entry# in the dictionary if necessary
return(user_groups)
print(groups_per_user({"local": ["admin", "userA"], "public": ["admin", "userB"], "administrator": ["admin"] }))
def groups_per_user(group_dictionary):
user_groups = {}
# Go through group_dictionary
for ___:
# Now go through the users in the group
for ___:
# Now add the group to the the list of
# groups for this user, creating the entry
# in the dictionary if necessary
return(user_groups)
print(groups_per_user({"local": ["admin", "userA"],
"public": ["admin", "userB"],
def groups_per_user(group_dictionary):
user_groups = {}
# Go through group_dictionary
for group, users in group_dictionary.items():
# Now go through the users in the group
for user in users:
# Now add the group to the the list of groups for this user, creating the entry in the dictionary if necessary
if user notin user_groups:
user_groups[user] = []
user_groups[user].append(group)
return user_groups
print(groups_per_user({“local”: [“admin”, “userA”],
“public”: [“admin”, “userB”],
“administrator”: [“admin”] }))
14. The dict.update method updates one dictionary with the items coming from the other dictionary, so that existing entries are replaced and new entries are added. What is the content of the dictionary “wardrobe“ at the end of the following code?
wardrobe = {'shirt': ['red', 'blue', 'white'], 'jeans': ['blue', 'black']}new_items = {'jeans': ['white'], 'scarf': ['yellow'], 'socks': ['black', 'brown']}wardrobe.update(new_items)
wardrobe = {'shirt': ['red', 'blue', 'white'], 'jeans': ['blue', 'black']}
new_items = {'jeans': ['white'], 'scarf': ['yellow'], 'socks': ['black', 'brown']}
- {‘jeans’: [‘white’], ‘scarf’: [‘yellow’], ‘socks’: [‘black’, ‘brown’]}
- {‘shirt’: [‘red’, ‘blue’, ‘white’], ‘jeans’: [‘white’], ‘scarf’: [‘yellow’], ‘socks’: [‘black’, ‘brown’]}
- {‘shirt’: [‘red’, ‘blue’, ‘white’], ‘jeans’: [‘blue’, ‘black’, ‘white’], ‘scarf’: [‘yellow’], ‘socks’: [‘black’, ‘brown’]}
- {‘shirt’: [‘red’, ‘blue’, ‘white’], ‘jeans’: [‘blue’, ‘black’], ‘jeans’: [‘white’], ‘scarf’: [‘yellow’], ‘socks’: [‘black’, ‘brown’]}
15. What’s a major advantage of using dictionaries over lists?
- Dictionaries are ordered sets
- Dictionaries can be accessed by the index number of the element
- Elements can be removed and inserted into dictionaries
- It’s quicker and easier to find a specific element in a dictionary
16. The add_prices function returns the total price of all of the groceries in the dictionary. Fill in the blanks to complete this function.
def add_prices(basket): # Initialize the variable that will be used for the calculation total = 0 # Iterate through the dictionary items for ___: # Add each price to the total calculation # Hint: how do you access the values of # dictionary items? total += ___ # Limit the return value to 2 decimal places return round(total, 2)
groceries = {"bananas": 1.56, "apples": 2.50, "oranges": 0.99, "bread": 4.59, "coffee": 6.99, "milk": 3.39, "eggs": 2.98, "cheese": 5.44}
print(add_prices(groceries)) # Should print 28.44
def add_prices(basket):
# Initialize the variable that will be used for the calculation
total = 0
# Iterate through the dictionary items
for ___:
# Add each price to the total calculation
# Hint: how do you access the values of
# dictionary items?
total += ___
# Limit the return value to 2 decimal places
return round(total, 2)
groceries = {"bananas": 1.56, "apples": 2.50, "oranges": 0.99, "bread": 4.59,
"coffee": 6.99, "milk": 3.39, "eggs": 2.98, "cheese": 5.44}
print(add_prices(groceries)) # Should print 28.44
def add_prices(basket):
# Initialize the variable that will be used for the calculation
total = 0
# Iterate through the dictionary items
for item in basket:
# Add each price to the total calculation
# Hint: how do you access the values of
# dictionary items?
total += basket[item]
# Limit the return value to 2 decimal places
returnround(total, 2)
groceries = {“bananas”: 1.56, “apples”: 2.50, “oranges”: 0.99, “bread”: 4.59,
“coffee”: 6.99, “milk”: 3.39, “eggs”: 2.98, “cheese”: 5.44}
print(add_prices(groceries)) # Should print 28.44
