5类和对象-----类方法、静态方法

#
HOST=‘127.0.0.1‘
PORT=3306
DB_PATH=r‘C:\Users\Administrator\PycharmProjects\test\面向对象编程\test1\db‘

class Mysql:
    def __init__(self, host, port):
        self.host = host
        self.port = port
    @classmethod
    def from_conf(cls):
        print(cls)
        return cls(HOST, PORT) #从配置文件中进行初始化
    def fun(self):
        print(‘self.fun()‘, self)
    @staticmethod
    def fun_static():
        print(‘form fun_static...‘)

print(Mysql.from_conf())
print(‘--------‘)
conn = Mysql.from_conf()
conn.from_conf()# 对象也可以调用，但默认传的第一个参数仍然是类，正常情况下不要乱去调用
print(‘--------‘)
m = Mysql(HOST, PORT)
Mysql.fun(m)
print(‘--------‘)
print(m.fun_static())