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Ex 7: Customer Dictionary

Problem​

We need to manage customer data using a Python dictionary. Follow a sequence of steps to create, modify, and query a customer record.

Rules​

  1. Create a dictionary named customer with: name ("John Doe"), age (32), and city ("New York").
  2. Add email ("john@johndoe.me") and phone (9836997456) using .update().
  3. Print the customer's name and city.
  4. Check if the key "email" exists in the dictionary.
  5. Remove the "age" field using .pop().
  6. Print all keys, values, and items.
  7. Remove and print the last inserted item using .popitem().
  8. Access the key "membership" safely using .get(), providing "no membership" as a default.
  9. Update the dictionary to include an "address" ("221B Baker Street").
  10. Print the final dictionary state.

Boilerplate​

Copy below code and paste to our IDE for head start.

# Write our code inside this function
def manage_customer():
    pass # remove this

# Call with test data
manage_customer()

Expected Output​

John Doe
New York
True
dict_keys(['name', 'city', 'email', 'phone'])
dict_values(['John Doe', 'New York', 'john@johndoe.me', 9836997456])
dict_items([('name', 'John Doe'), ('city', 'New York'), ('email', 'john@johndoe.me'), ('phone', 9836997456)])
('phone', 9836997456)
no membership
{'name': 'John Doe', 'city': 'New York', 'email': 'john@johndoe.me', 'address': '221B Baker Street'}

Solution​

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Show solution
def manage_customer():
    # Step 1: Create a customer dictionary
    customer: dict[str, str | int] = {"name": "John Doe", "age": 32, "city": "New York"}

    # Step 2: Add email and phone
    customer.update({"email": "john@johndoe.me", "phone": 9836997456})

    # Step 3: Access values
    print(customer["name"])
    print(customer["city"])

    # Step 4: Membership check
    print("email" in customer)

    # Step 5: Remove a field
    customer.pop("age")

    # Step 6: View keys, values, and items
    print(customer.keys())
    print(customer.values())
    print(customer.items())

    # Step 7: Remove last item
    print(customer.popitem())

    # Step 8: Safe access with default
    print(customer.get("membership", "no membership"))

    # Step 9: Final update
    customer.update({"address": "221B Baker Street"})

    # Step 10: Final state
    print(customer)

# Run the function
manage_customer()

Details​

Using .get() is much safer than direct indexing because it won't crash if the key is missing. It's a standard Python pattern to use .get() with a default value to provide a fallback without needing extra if checks.