Python类中使用的’cls’变量是什么？

为什么在Python类中有时使用cl而不是self作为参数？

例如：

class Person:
    def __init__(self, firstname, lastname):
        self.firstname = firstname
        self.lastname = lastname

    @classmethod
    def from_fullname(cls, fullname):
        cls.firstname, cls.lastname = fullname.split(' ', 1)

解决方法:

“自我”和“cls”之间的区别在PEP 8中定义.正如阿德里安所说,这不是强制性的.这是一种编码风格. PEP 8说：

Function and method arguments:

Always use self for the first argument to instance methods.

Always use cls for the first argument to class methods.

标签：self,python,class,object,terminology
来源： https://codeday.me/bug/20190918/1810466.html