Python3 挑战实验 -- 类和Collection(实验楼学习笔记)

#!/usr/bin/env python3
import sys
from collections import Counter
class Person(object):
    def __init__(self, grade):
        self.grade = grade
    def get_grade(self):
        return self.grade
class Student(Person):
    def __init__(self, grade):
        Person.__init__(self, grade)
    def get_grade(self):
        x = Counter(self.grade)
        return "Pass: {}, False: {}".format(len(self.grade)-x['D'], x['D'])
class Teacher(Person):
    def __init__(self, grade):
        Person.__init__(self, grade)
    def get_grade(self):
        results = []
        grades = Counter(self.grade).most_common(4)
        for key,value in grades:
            s = key + ":" + str(value)
            results.append(s)

        return ", ".join(results)
if __name__ == '__main__':
    if sys.argv[1]  == 'student':
        student = Student(sys.argv[2])
        print(student.get_grade())
    else:
        teacher = Teacher(sys.argv[2])
        print(teacher.get_grade())