Python Dictionaries - Quiz 2

Which of these about a dictionary is false?

• The values of a dictionary can be accessed using keys

• The keys of a dictionary can be accessed using values

• Dictionaries aren’t ordered

• Dictionaries are mutable

Which of the following is not a declaration of the dictionary?

• d = {1: ‘A’, 2: ‘B’}

• d = dict([[1,”A”],[2,”B”]])

• d = {1,”A”,2”B”}

• d = { }

What will be the output of the following Python code snippet?

a={1:"A",2:"B",3:"C"}

for i,j in a.items():

print(i,j,end=" ")

• 1 A 2 B 3 C

• 1 2 3

• A B C

• 1:”A” 2:”B” 3:”C”

What will be the output of the following Python code?
a={1:"A",2:"B",3:"C"}
b={4:"D",5:"E"}
a.update(b)
print(a)

• {1: ‘A’, 2: ‘B’, 3: ‘C’}

• Method update() doesn’t exist for dictionaries

• {1: ‘A’, 2: ‘B’, 3: ‘C’, 4: ‘D’, 5: ‘E’}

• {4: ‘D’, 5: ‘E’}

  
  

What will be the output of the following Python code?

 a={1:"A",2:"B",3:"C"}

b=a.copy()
b[2]="D"
print(a)

• Error, copy() method doesn’t exist for dictionaries

• {1: ‘A’, 2: ‘B’, 3: ‘C’}

• {1: ‘A’, 2: ‘D’, 3: ‘C’}

• “None” is printed

What will be the output of the following Python code?

 a={1:"A",2:"B",3:"C"}

a.clear()
print(a)

• None

• { None:None, None:None, None:None}

• {1:None, 2:None, 3:None}

• { }

What will be the output of the following Python code?

a={1:"A",2:"B",3:"C"}

for i in a:

print(i,end=" ")

• 1 2 3

• ‘A’ ‘B’ ‘C’

• 1 ‘A’ 2 ‘B’ 3 ‘C’

• Error, it should be: for i in a.items():

What will be the output of the following Python code?

a={1:"A",2:"B",3:"C"}

print(a.items())

• Syntax error

• dict_items([(‘A’), (‘B’), (‘C’)])

• dict_items([(1,2,3)])

• dict_items([(1, ‘A’), (2, ‘B’), (3, ‘C’)])

What will be the output of the following Python code snippet?

>>> a={1:"A",2:"B",3:"C"}

>>> del a

• method del doesn’t exist for the dictionary

• del deletes the values in the dictionary

• del deletes the entire dictionary

• del deletes the keys in the dictionary

What will be the output of the following Python code snippet?

test = {1:'A', 2:'B', 3:'C'}

test = {}

print(len(test))

• 0

• None

• 3

• An exception is thrown