Nested Dictionaries

# Nested dictionary
company = {
    "name": "TechCorp",
    "departments": {
        "engineering": {
            "head": "Alice",
            "team_size": 25,
            "projects": ["API", "Frontend", "DevOps"]
        },
        "marketing": {
            "head": "Bob",
            "team_size": 15,
            "projects": ["Campaign", "SEO"]
        }
    }
}

# Access nested values
print(company["departments"]["engineering"]["head"])  # Alice
print(company["departments"]["engineering"]["projects"][0])  # API

# Safe nested access
eng = company.get("departments", {}).get("engineering", {})
print(eng.get("team_size", 0))  # 25

# Iterate nested
for dept_name, dept_info in company["departments"].items():
    print(f"\n{dept_name.upper()}")
    print(f"  Head: {dept_info['head']}")
    print(f"  Team: {dept_info['team_size']}")
    print(f"  Projects: {', '.join(dept_info['projects'])}")