Python 类和实例

class A(object):
    def __init__(self, host, user, pwd, port):
        self.host = host
        self.user = user
        self.pwd = pwd
        self.port = port
ob_vs = Vsphere("172",
                "local",
                "Server",
                 443)

class A(object)定义一个A类继承于object

 # def _init_ 类似于构造函数，第一个参数必须是self

self.host = host为类的属性赋值

ob_vs = Vsphere.__init__("172","local","Server",443)  创建实例时不需要传self参数