python中魔法怎么使用

class Company(object):

    def __init__(self, employee_list):

        self.employee = employee_list

company = Company(["tom", "bob", "jane"])

for item in company.employee:

    print(item)

class Company(object):

    def __init__(self, employee_list):

        self.employee = employee_list

    def __getitem__(self, item):

        return self.employee[item]

company = Company(["tom", "bob", "jane"])

company1= company[:2]

for item in company1:

    print(item)