# Example: Representing a user profile with multiple addresses and roles
user_profile_data = {
    "id": "usr_123",
    "username": "johndoe",
    "email": "john.doe@example.com",
    "is_active": True,
    "roles": ["admin", "editor"],
    "addresses": [
        {
            "type": "shipping",
            "street": "123 Main St",
            "city": "Anytown",
            "zip": "12345"
        },
        {
            "type": "billing",
            "street": "456 Oak Ave",
            "city": "Otherville",
            "zip": "67890"
        }
    ],
    "preferences": {
        "newsletter": True,
        "theme": "dark",
        "notifications": ["email", "sms"]
    }
}

print("User ID:", user_profile_data["id"])
print("Email:", user_profile_data.get("email", "N/A"))
print("First Role:", user_profile_data["roles"][0])

# Accessing nested list of dictionaries
for address in user_profile_data["addresses"]:
    if address["type"] == "shipping":
        print(f"Shipping Address: {address['street']}, {address['city']}")

# Accessing nested dictionary
print("Preferred Theme:", user_profile_data["preferences"]["theme"])

# Adding a new role
user_profile_data["roles"].append("viewer")
print("Updated Roles:", user_profile_data["roles"])

# Adding a new preference
user_profile_data["preferences"]["language"] = "en-US"
print("Updated Preferences:", user_profile_data["preferences"])