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Learn Python 3 - Free Interactive Course

Solution: Contact book

Explore how to build a contact book program using Python dictionaries and functions. Understand storing key–value pairs for contacts and retrieving phone numbers efficiently, enhancing your use of reusable structures in Python.

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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"])