class Employee():
    def __init__(self, first_name, last_name, salary):
        self.first_name = first_name
        self.last_name = last_name
        self.salary = salary

    @classmethod
    def from_string(cls, string):
        cls.string = string = string.replace("-", ", ")
        cls.string = string = string.split(" ")
        cls.first_name = string[0]
        cls.last_name = string[1]
        cls.salary = string[2]


"""
first_name = "Klaus"
last_name = "Mikealson"
salary = 2000
emp1 = Employee(first_name, last_name, salary)
вот это работает
"""

"""
emp2 = Employee.from_string("frist_name-last_name-salary")
А вот эта фигня не работает.

Ошибка где-то
Traceback (most recent call last):
  File "<pyshell#54>", line 1, in <module>
    emp2.first_name
AttributeError: 'NoneType' object has no attribute 'first_name'

Помогите пожалуйста
"""