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Solution: Contact book

Explore how to implement a contact book program in Python by using dictionaries to store and access contact details. Understand key-value pairs and how to retrieve information by keys, enabling you to build reusable and efficient data structures in your projects.

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This program stores contact information in a dictionary and then prints a specific phone number.

  • contacts is a dictionary — a collection of key–value pairs.

    • Each key (like "Mom" or "Pizza Place") is a label.

    • Each value (like "555-1234") is the information linked to that label.

  • To get a specific value, you use its key in square brackets:

Python
contacts = {
    "Mom": "555-1234",
    "Best Friend": "555-5678",
    "Pizza Place": "555-9999"
}
print("Call Pizza Place at", contacts["Pizza Place"])