Problem Solving using Python and R - UNIT II - Dictionary

What is the correct way to create a dictionary in Python?

• my_dict = {1: 'one', 2: 'two'}

• my_dict = (1: 'one', 2: 'two')

• my_dict = [1: 'one', 2: 'two']

• my_dict = <1: 'one', 2: 'two'>

How do you access the value associated with the key 'name' in the dictionary person = {'name': 'Alice', 'age': 25}?

• person.name

• person['name']

• person.get('name')

• Both B and C

Which method would you use to remove a key-value pair from a dictionary?

• remove()

• delete()

• pop()

• discard()

What will be the output of the following code? python my_dict = {'a': 1, 'b': 2} print(my_dict.get('c', 3))

• None

• 3

• KeyError

• 0

Which of the following statements is true about Python dictionaries?

• Keys must be mutable.

• Values must be unique.

• Dictionaries are ordered collections.

• Keys must be unique.

How can you check if a key exists in a dictionary?

• key in dict

• dict.has_key(key)

• dict.contains(key)

• key.exists(dict)

What will be the output of the following code? python my_dict = {'x': 10, 'y': 20} my_dict['x'] += 5 print(my_dict['x'])

• 10

• 15

• 20

• 25

Which of the following methods can be used to get all the keys from a dictionary?

• my_dict.keys()

• my_dict.all_keys()

• my_dict.get_keys()

• my_dict.key()

What will be the result of the following code? python my_dict = {'a': 1, 'b': 2} my_dict['c'] = 3 print(len(my_dict))

• 2

• 3

• 4

• 1

Which of the following is a valid way to merge two dictionaries in Python 3.9 and later?

• dict1 + dict2

• dict1.update(dict2)

• dict3 = dict1 | dict2

• dict3 = merge(dict1, dict2)