Python 官方文档:入门教程 => 点击学习
python 元编程是一种高级编程技术,允许开发者在运行时修改 Python 代码本身。这为 Python 带来了强大的灵活性和动态性,使其成为构建复杂和可扩展应用程序的理想选择。 理解元类: 元类是创建类的类。通过使用元类,我们可以
python 元编程是一种高级编程技术,允许开发者在运行时修改 Python 代码本身。这为 Python 带来了强大的灵活性和动态性,使其成为构建复杂和可扩展应用程序的理想选择。
class Meta(type):
def __new__(cls, name, bases, attrs):
attrs["new_attr"] = "new value"
return super().__new__(cls, name, bases, attrs)
class MyClass(metaclass=Meta):
pass
obj = MyClass()
print(obj.new_attr) # Output: "new value"
def create_class(name, bases, attrs):
return type(name, bases, attrs)
def create_instance(cls, *args, **kwargs):
obj = cls.__new__(cls)
cls.__init__(obj, *args, **kwargs)
return obj
MyClass = create_class("MyClass", (), {})
obj = create_instance(MyClass)
class MyClass:
def __init__(self, name):
self.name = name
def greet(self):
print(f"Hello, {self.name}!")
def modify_class(cls):
cls.new_attr = "new value"
def new_greet(self):
print(f"Modified greeting: {self.name}!")
cls.greet = new_greet
modify_class(MyClass)
obj = MyClass("John")
obj.greet() # Output: "Modified greeting: John!"
def log_method_calls(cls):
def wrapper(self, *args, **kwargs):
print(f"Calling method {self.__class__.__name__}.{self.__class__.__qualname__}")
return cls.__call__(self, *args, **kwargs)
cls.__call__ = wrapper
return cls
@log_method_calls
class MyClass:
def __init__(self, name):
self.name = name
def greet(self):
print(f"Hello, {self.name}!")
obj = MyClass("John")
obj.greet() # Output: "Calling method MyClass.MyClass"
class Proxy(object):
def __init__(self, obj):
self._obj = obj
def __getattr__(self, name):
return getattr(self._obj, name)
def __setattr__(self, name, value):
setattr(self._obj, name, value)
class MyClass:
def __init__(self, name):
self.name = name
def greet(self):
print(f"Hello, {self.name}!")
obj = MyClass("John")
proxy = Proxy(obj)
proxy.greet() # Output: "Hello, John!"
Python 元编程为开发者提供了强大的工具,使他们能够创建动态、灵活且可扩展的应用程序。通过理解并熟练运用元编程技术,开发者可以将 Python 的功能发挥到极致。
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本文标题: 踏入Python元编程之旅:无限魔力的探索
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