Practical Data Science using Python - Python Dictionaries 1

The video tutorial provides a comprehensive guide to Python dictionaries, covering their structure, properties, and usage. It explains how dictionaries are collections of key-value pairs, their mutability, and the importance of unique keys. The tutorial includes examples of creating dictionaries, accessing elements, and using nested dictionaries. It also covers modifying dictionaries by adding, updating, and removing elements, and demonstrates error handling with try-except blocks. Additionally, it explores various dictionary functions like pop, clear, and copy, and how to handle key errors effectively.

What is the primary reason keys in a Python dictionary must be unique?

• To enable faster computation

• To allow duplicate values

• To prevent confusion when accessing elements

• To ensure values are mutable

Which of the following is a valid way to create a dictionary in Python?

• Using angle brackets

• Using parentheses

• Using square brackets

• Using curly braces

How can you create a dictionary from a list of tuples?

• By using the list() function

• By using the dict() function

• By using the set() function

• By using the tuple() function

What is the correct way to access a value in a nested dictionary?

• Using the index of the value

• Using only the nested key

• Using only the outer key

• Using both the outer and nested keys

Which method is used to add a new key-value pair to an existing dictionary?

• add()

• update()

• insert()

• append()

What happens when you use the del statement on a dictionary key?

• The specified key-value pair is removed

• The dictionary is cleared

• The key is set to None

• The entire dictionary is deleted

How can you handle a KeyError when accessing a dictionary?

• By using a print statement

• By using a for loop

• By using a while loop

• By using a try-except block

What does the clear() method do to a dictionary?

• Copies the dictionary

• Adds a new key-value pair

• Removes all key-value pairs

• Deletes the dictionary

Which function can be used to safely access a value in a dictionary without causing an error?

• search()

• find()

• get()

• locate()

What is the result of using the copy() method on a dictionary?

• A new dictionary with the same key-value pairs

• A reference to the original dictionary

• An empty dictionary

• A dictionary with reversed key-value pairs