Dictionaries

Exercise 1

Find out what each of the expressions does to the dictionary in the center.

Exercise 2

What do the following commands produce?

d = {1:'A', 'B':1, 'A':True}
print(d['A'])

• False
• "B"
• True
• 1

Exercise 3

What do these commands produce?

d = {1:'A', 'B':1, 'A':True}
print(d.has_key('B'))

• 1
• True
• "B"
• False

Exercise 4

What do these commands produce?

d = {1:'A', 'B':1, 'A':True}
print(d.values())

• True
• ['A', 1, True]
• 3
• [1, 'B', 'A']

Exercise 5

What do these commands produce?

d = {1:'A', 'B':1, 'A':True}
print(d.keys())

• [1, 'B', 'A']
• ['A', 'B', 1]
• [1, 'A', 'B']
• The order may vary

Exercise 6

What do these commands produce?

d = {1:'A', 'B':1, 'A':True}
print(d['C'])

• None
• 'C'
• an Error
• False

Exercise 7

What do these commands produce?

d = {1:'A', 'B':1, 'A':True}
d.setdefault('C', 3)
print(d['C'])

• 3
• 'C'
• None
• an Error