Apart from lists, dictionaries are perhaps the most flexible built-in data type in Python. If you think of lists as ordered collections of objects, you can think of dictionaries as unordered collections; the chief distinction is that in dictionaries, items are stored and fetched by key, instead of by positional offset.

Being a built-in type, dictionaries can replace many of the searching algorithms and data structures you might have to implement manually in lower-level languages— indexing a dictionary is a very fast search operation. Dictionaries also sometimes do the work of records and symbol tables used in other languages, can represent sparse (mostly empty) data structures, and much more. Here’s a rundown of their main properties. Python dictionaries are:

• Accessed by key, not offset.
• Unordered collections of arbitrary objects.
• Variable-length, heterogeneous, and arbitrarily nestable.
• Of the category “mutable mapping”.
• Tables of object references (hash tables).

Quiz Description: 

Name: Dictionaries MCQ Questions and Answers: Python Online Test

Subject:  Python

Topic:  Introduction

Questions: 15 Objective Type Questions

Time Allowed: 15 Minutes

Language: English

Important for:  B. Tech. / M. Tech. Students, B.Sc. / M.Sc. (CS / IT) and aspirants of competitive exams, computer science job interviews, Python job interviews, etc.

Created By: Esha Tripathi