使用.get() python通过函数传递参数

dict.get(key, default=None)

# 示例字典
person = {
    "name": "Alice",
    "age": 30
}

# 使用 .get() 获取存在的键
name = person.get("name")
print(f"Name: {name}")  # 输出: Name: Alice

# 使用 .get() 获取不存在的键，并提供默认值
gender = person.get("gender", "Unknown")
print(f"Gender: {gender}")  # 输出: Gender: Unknown

# 使用 .get() 获取不存在的键，不提供默认值
address = person.get("address")
print(f"Address: {address}")  # 输出: Address: None

nested_dict = {
    "user": {
        "name": "Bob",
        "details": {
            "age": 25
        }
    }
}

# 安全地访问嵌套字典
age = nested_dict.get("user", {}).get("details", {}).get("age")
print(f"Age: {age}")  # 输出: Age: 25

# 如果某个键不存在，返回默认值
city = nested_dict.get("user", {}).get("details", {}).get("city", "Unknown")
print(f"City: {city}")  # 输出: City: Unknown