Dictionary

Question 1

Dictionaries

Answer 1

• Python’s implementation of a data structure, generally known as associative arrays, hashes, or hashmaps.
• Mapping between a set of indexes known as keys and a set of values.
• key:value

Question 2

Create a dictionary to store employee record

Answer 2

D = {‘name’: ‘Bob’, ‘age’: 25, ‘job’: ‘Dev’, ‘city’: ‘New York’, ‘email’: ‘bob@web.com’}

Question 3

When do you use Dictionaries vs. list?

Answer 3

• Dictionaries items are Unordered and can’t be sorted.
• Dictionaries retieved by key name.
• List are retrieved by location.
• List ordered sequenced can be indexed or sliced.

Question 4

prices_lookup = {‘apple’:2.99, ‘oranges’:1.99, ‘milk’:5.80}

Call the price of apple

milk

oranges

Answer 4

prices_lookup[‘apple’]

2.99

prices_lookup[‘milk’]

5.80

prices_lookup[‘oranges’]

1.99

Question 5

• Do dictionaries keep an order?

Answer 5

Dictionaries are mappings and do not retain order!

Question 6

Given d={‘k1’:[1,2,3]}

What is the output of d[‘k1’][1]

Answer 6

2

Question 7

Is this statement True or False? Dictionaries are immutable.

Answer 7

False