爬虫的子父类

栗子：编程开发人员学 Python 的话，学习效率很高，默认为1。
          而且，job 的属性为 programmer。
class Student:

    def __init__(self,name,job=None,time=0.00,time_effective=0.00):

        self.name=name

        self.job=job

        self.time=time

        self.time_effective=time_effective

    def count_time(self,hour,rate):

        self.time+=hour

        self.time_effective+=hour*rate

class Programmer(Student):

    def __init__(self,name):

        Student.__init__(self,name,job='programmer',time=0.00,time_effctive=0.00)

    def count_time(self,hour):

        Student.count_time(self,hour,rate=1)

student1=Student('韩梅梅')

student2=Programmer('李华')

print(student1.job)

print(student2.job)

student1.count_time(10.0,0.8)

student2.count_time(10)

print(student1.time_effective)

print(student2.time_effective)