Dictionaries

This video tutorial covers the concept of dictionaries in Python, a dynamic and mutable data structure that uses keys to access elements. It explains how to define, access, modify, and delete dictionary entries, emphasizing the importance of keys being immutable. The tutorial also explores various operations and functions available for dictionaries, such as len, keys, values, pop, and get. The video concludes by encouraging further exploration of advanced data structures in Python.

What is a key characteristic that differentiates dictionaries from lists?

• Dictionaries are immutable.

• Dictionaries use keys to access elements.

• Dictionaries are ordered.

• Dictionaries cannot be nested.

How can you access a specific element in a dictionary?

• By using its index.

• By using its position.

• By using its key.

• By using its value.

Which method is used to delete an entry from a dictionary?

• delete()

• erase()

• del

• remove()

What should be the type of dictionary keys?

• Any data type.

• Immutable types like strings.

• Only integers.

• Mutable types like lists.

What happens if you specify the same key twice in a dictionary?

• An error is raised.

• The first key is used.

• Both keys are stored.

• The second key overrides the first.

Which method returns the keys of a dictionary as a list?

• values()

• pop()

• get()

• keys()

What does the len() function return when used on a dictionary?

• The number of keys.

• The number of values.

• The number of key-value pairs.

• The total size in bytes.