python使用getattr的更通用的解决方案

class MyClass:
    def __init__(self):
        self.attribute1 = "value1"
        self.attribute2 = "value2"

    def method1(self):
        return "method1 called"

    def method2(self):
        return "method2 called"

instance = MyClass()

# 获取属性值
attribute1 = getattr(instance, "attribute1", "default_value")
print(attribute1)  # 输出：value1

# 获取方法并调用
method1 = getattr(instance, "method1", None)
if method1:
    result = method1()
    print(result)  # 输出：method1 called

class MyClass:
    def method1(self):
        return "method1 called"

    def method2(self):
        return "method2 called"

def call_method(instance, method_name):
    method = getattr(instance, method_name, None)
    if method:
        return method()
    else:
        return f"Method '{method_name}' not found."

instance = MyClass()
print(call_method(instance, "method1"))  # 输出：method1 called
print(call_method(instance, "method2"))  # 输出：method2 called

class MyClass:
    def __init__(self):
        self.attribute1 = "value1"
        self.attribute2 = "value2"

    def __getattr__(self, name):
        if name.startswith("custom_"):
            return f"Custom attribute '{name}' accessed."
        raise AttributeError(f"'{self.__class__.__name__}' object has no attribute '{name}'")

instance = MyClass()
print(instance.custom_attribute)  # 输出：Custom attribute 'custom_attribute' accessed.