@classmethod和cls()方法的小结

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/loovelj/article/details/82415290

最近在看代码，发现有个类初始化的时候，明明调用下面的Open方法，但是init方法中的stream竟然有参数，我疑惑了好久，查找文档暂时没有查到相关概念，但是经过试验是可以的。代码如下

class Test(object):


    def __init__(self, stream,manes):

        self.stream = stream
        self.manes=manes
        print(self.stream)
        print(self.manes)


    @classmethod
    def open(cls, path,manes):
         # return cls(open(path, "rb"), **kwargs)
        return  cls(path,manes)
        # return  path,manes

    @staticmethod
    def open1( path,manes):
         # return cls(open(path, "rb"), **kwargs)
        return  path,manes
        # return  path,manes

print(Test.open("ccc","ddd"))
输出：
ccc
ddd
<__main__.Test object at 0x000002381A7725C0>

print(Test("ccc","ddd"))
输出：
ccc
ddd
<__main__.Test object at 0x000002381A7725C0>

最近又试了一个静态方法


print(Test.open("ccc","ddd") is Test.open("ccc","ddd")) #False
print(Test.open1("ccc","ddd") is Test.open1("ccc","ddd"))#False
print(Test.open is Test.open)#False
print(Test.open1 is Test.open1)#True