Reading and Updating Python Dictionaries

Creating a dictionary is only the beginning. This Block shows you how to work with the information inside: read values using their keys, add new key-value pairs, replace existing values, and calculate updates from values already stored in the dictionary.

What you will learn:

• Read known values with square-bracket syntax
• Understand why a missing key can raise a KeyError
• Add new key-value pairs with assignment
• Update existing values using the same syntax
• Calculate a new value from the current one
• Avoid common mistakes with spelling and capitalization

By the end, you will be able to read and change dictionary data with confidence—one clearly labeled value at a time.