这种方法怎么样？
p、 为了清晰起见，代码没有进行结构优化

from functools import wraps
class A:
    pass
def add_class_method(cls):
    def decorator(f):
        @wraps(f)
        def inner(_, *args,**kwargs):
            return f(*args,**kwargs)
        setattr(cls, inner.__name__, classmethod(inner))
        return f
    return decorator
def add_instance_method(cls):
    def decorator(f):
        @wraps(f)
        def inner(_, *args,**kwargs):
            return f(*args,**kwargs)
        setattr(cls, inner.__name__, inner)
        return f
    return decorator
@add_class_method(A)
def foo():
    return "Hello!"
@add_instance_method(A)
def bar():
    return "Hello again!"
assert A.foo() == "Hello!"
assert A().bar() == "Hello again!"

这就是你想要的：

class A:
    def __init__(self):
        pass
    @classmethod
    def foo(cls):
        return "Hello!"
    def bar(self):
        return "Hello again!"
print(A.foo())
print(A().bar())

在此处阅读文档

class MyClass:
    def method(self):
        # instance Method
        return 'instance method called', self
    @classmethod
    def cls_method(cls):
        #Classmethod
        return 'class method called', cls
    @staticmethod
    def static_method():
        # static method
        return 'static method called'

您需要示例化myclass来访问（调用）示例方法

test = MyClass()
test.method()

您可以直接访问类方法，而无需示例化

MyClass.cls_method()
MyClass.static_method()