python dictionary

Select correct ways to create an empty dictionary

• sampleDict = {}

• sampleDict = dict()

• sampleDict = dict{}

• sampleDict = ()

What is the output of the following dictionary operation

dict1 = {"name": "Mike", "salary": 8000}

temp = dict1.get("age")

print(temp)

• KeyError: ‘age’

• None

Select the all correct way to remove the key ‘marks‘ from a dictionary

student = { "name": "Emma", "class": 9, "marks": 75 }

• student.pop(“marks”)

• del student[“marks”]

• student.popitem()

• dict1.remove(“key2”)

Items are accessed by their position in a dictionary and All the keys in a dictionary must be of the same type.

• True

• False

Dictionary keys must be immutable

• True

• False

Which of the following statements create a dictionary?

• d = {}

• d = {“john”:40, “peter”:45}

• d = {40:”john”, 45:”peter”}

• All of the mentioned

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

d = {"john":40, "peter":45}

d["john"]

• 40

• 45

• “john”

• “peter”

Suppose d = {“john”:40, “peter”:45}, to delete the entry for “john” what command do we use?

• d.delete(“john”:40)

• d.delete(“john”)

• del d[“john”]

• del d(“john”:40)

Suppose d = {“john”:40, “peter”:45}. To obtain the number of entries in dictionary which command do we use?

• d.size()

• len(d)

• size(d)

• d.len()

Suppose d = {“john”:40, “peter”:45}, what happens when we try to retrieve a value using the expression d[“susan”]?

• Since “susan” is not a value in the set, Python raises a KeyError exception

• It is executed fine and no exception is raised, and it returns None

• Since “susan” is not a key in the set, Python raises a KeyError exception

• Since “susan” is not a key in the set, Python raises a syntax error