Python中kwargs.get()方法语法及高级用法详解

value = kwargs.get(key, default)

def example_function(**kwargs):
    # 安全获取参数，如果不存在则返回默认值
    param1 = kwargs.get('param1', 'default_value1')
    param2 = kwargs.get('param2', 100)
    
    print(f"param1: {param1}, param2: {param2}")

# 调用示例
example_function(param1="hello")  # 输出: param1: hello, param2: 100
example_function()               # 输出: param1: default_value1, param2: 100

user_info = {'name': 'Alice', 'age': 30}

# 安全获取值
email = user_info.get('email', 'unknown@example.com')
print(email)  # 输出: unknown@example.com

config = {
    'database': {
        'host': 'localhost',
        'port': 5432
    }
}

# 安全获取嵌套值
db_port = config.get('database', {}).get('port', 3306)
print(db_port)  # 输出: 5432

# 如果值为None或不存在，则使用备用值
value = kwargs.get('some_key') or 'backup_value'

def configure_settings(**options):
    # 获取配置，设置合理的默认值
    timeout = options.get('timeout', 30)
    retries = options.get('retries', 3)
    verbose = options.get('verbose', False)
    
    print(f"配置: timeout={timeout}, retries={retries}, verbose={verbose}")

# 调用
configure_settings(timeout=60)  # 输出: 配置: timeout=60, retries=3, verbose=False