Description

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Beginner · 10 min

Named data with dictionaries

Store related values under meaningful keys.

Look up a key

A dictionary stores key-value pairs inside braces. Put a colon between each key and value. Use a key in square brackets to retrieve its value.

product = {"name": "Notebook", "price": 4}
print(product["name"])
print(product["price"])

Output

Notebook
4

Update or add a value

Assign to a key to update it or add a new one. get() can supply a default when a key is missing; direct indexing of a missing key raises an error.

product = {"price": 4}
product["price"] = 5
print(product["price"])
print(product.get("stock", 0))

Output

5
0

Named data with dictionaries

  1. Pair each key with its value.
  2. Compare an existing key with a missing key.

Try it yourself

Code runs on this device. When you are signed in, drafts sync to your account.

Update a product

Change the product price to 6. Store price multiplied by quantity in total, then display total.

Practice