Python dictionary exercises

Dictionaries are optimized to retrieve values when the key is known . The following declares a dictionary object. Example: Dictionary. capitals = {“USA”:”Washington D.C.”, “France”:”Paris”, “India”:”New Delhi”} Above, capitals is a dictionary object which contains key-value pairs inside { } .

Python dictionaries can be used when the data has a unique reference that can be associated with the value . As dictionaries are mutable, it is not a good idea to use dictionaries to store data that shouldn’t be modified in the first place.

Dictionaries are important data structures in Python that use keys for indexing . They are an unordered sequence of items (key-value pairs), which means the order is not preserved. The keys are immutable.

1. What is a Python dictionary? A dictionary is an unordered and mutable Python container that stores mappings of unique keys to values . Dictionaries are written with curly brackets ({}), including key-value pairs separated by commas (,). A colon (:) separates each key from its value.