Python - Object-Oriented Programming - class, inheritance, super, methods(__str__, __repr__)

Practical Programming
楽天ブックス 紀伊国屋書店

開発環境

• macOS Catalina - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Python 3.8 (プログラミング言語)

Practical Programming: An Introduction to Computer Science Using Python 3.6 (Paul Gries(著)、Jennifer Campbell(著)、Jason Montojo(著)、Pragmatic Bookshelf)のChapter 14(Object-Oriented Programming)、Exercise 3の解答を求めてみる。

コード

#!/usr/bin/env python3
class Member:
    def __init__(self, name: str, address: str, email: str) -> None:
        self.name = name
        self.address = address
        self.email = email

    def __str__(self):
        return f'{self.name}\n{self.address}\n{self.email}'

    def __repr__(self):
        s = str(self).replace('\n', ', ')
        return f'{self.__class__.__name__}({s})'


class Faculty(Member):
    def __init__(self, name: str, address: str, email: str,
                 faculty_num: str) -> None:
        super().__init__(name, address, email)
        self.faculty_num = faculty_num

    def __str__(self):
        return f'{super().__str__()}\n{self.faculty_num}'

    def __repr__(self):
        s = str(self).replace('\n', ', ')
        return f'{self.__class__.__name__}({s})'


class Student(Member):
    def __init__(self, name: str, address: str, email: str,
                 student_num: str) -> None:
        super().__init__(name, address, email)
        self.student_num = student_num
        self.courses_taken = []
        self.courses_taking = []

    def __str__(self):
        return f'{super().__str__()}\n' + \
            f'taken: {self.courses_taken}\ntaking: {self.courses_taking}'

    def __repr__(self):
        s = str(self).replace('\n', ', ')
        return f'{self.__class__.__name__}({s})'


if __name__ == "__main__":
    student = Student("name1", "address1", "email1", "1")
    member = Member('name2', 'address2', 'email2')
    faculty = Faculty('name3', 'address3', 'email3', '3')
    members = [student, member, faculty]
    for member in members:
        print(type(member), member, repr(member), sep='\n')

入出力結果(Zsh、PowerShell、Terminal、Jupyter(IPython))

% ./university.py
<class '__main__.Student'>
name1
address1
email1
taken: []
taking: []
Student(name1, address1, email1, taken: [], taking: [])
<class '__main__.Member'>
name2
address2
email2
Member(name2, address2, email2)
<class '__main__.Faculty'>
name3
address3
email3
3
Faculty(name3, address3, email3, 3)
%