策略模式

import time


class LocalStrategy:
    def execute(self):
        print("this is a local 104 execute")


class SaasStrategy:
    def execute(self):
        print("this is a saas execute")


class Switch:
    def __init__(self, strategy) -> None:
        self.strategy = strategy

    def set_strategy(self, strategy):
        self.strategy = strategy

    def execute(self):
        self.strategy.execute()


local_strategy = LocalStrategy()
saas_strategy = SaasStrategy()
switch = Switch(local_strategy)

for i in range(5):
    if i % 2 == 0:
        switch.set_strategy(saas_strategy)
    else:
        switch.set_strategy(local_strategy)
    switch.execute()
    time.sleep(1)