Class methods as alternative constructor

- 
class Employee:
    no_of_leaves = 8

    def __init__(self, aname, asalary, arole):
        self.name = aname
        self.salary = asalary
        self.role = arole

    @classmethod
    def from_str(cls, string):
        '''params=string.split("-")

        return cls(params[0],params[1],params[2])'''
        return cls(*string.split("-"))


karan = Employee.from_str("karan-25000-datascientist")

print(karan.salary)

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