python 实现 switch case

构造如下 Case 类，包含两个方法 test 和 act ，test 用于判断条件， act 用于执行相应操作

class Case:
    def test(self):
        pass
    def act(self):
        pass
    
class Case1(Case):
    def test(self, state):
        return state == 1
    def act(self, state):
        print('case 1')
        
class Case2(Case):
    def test(self, state):
        return state == 2
    def act(self, state):
        print('case 2')
        
class Case3(Case):
    def test(self, state):
        return state == 3
    def act(self, state):
        print('case 3')

class CaseDefault(Case):
    def test(self, state):
        return True
    def act(self, state):
        print('No match case!')
        

然后就可以使用 for 循环来实现 switch-case 啦！

cases = [
    Case1(), 
    Case2(),
    Case3(),
    CaseDefault()
]

state = 1 

for case in cases:
    if case.test(state):
        case.act(state)
        break