210412 TIL
TIL
オペレーティングシステムの学習
深化する
class Student():
"""
Student Class
Author: sdk
Date: 2021.04.12
"""
# 클래스 변수
student_count = 0
def __init__(self, name, number, grade, details, email=None):
# 인스턴스 변수
self._name = name
self._number = number
self._grade = grade
self._details = details
self._email = email
# 클래스 변수에 접근하기
Student.student_count += 1
def __str__(self):
return 'str {}'.format(self._name)
def __repr__(self):
return 'repr {}'.format(self._name)
def detail_info(self):
print('Current Id : {}'.format(id(self)))
print('student Detail Info : {} {} {}'.format(self._name, self._email, self._details))
def __del__(self):
Student.student_count -= 1
# self의 의미
studt1 = Student('cho', 2 ,3, {'gender': 'Male', 'score1': 65, 'score2': 44})
studt2 = Student('chang', 4 ,1, {'gender': 'Female', 'score1': 85, 'score2': 74}, '[email protected]')
# 아이디 값이 다르다.
print(id(studt1)) # 140202496724944
print(id(studt2)) # 140202496724848
# is 는 아이디 값을 비교, == 는 값을 비교
print(studt1._name == studt2._name) # False
print(studt1 is studt2) # False
# dir & __dict__ 확인
print(dir(studt1)) #['__class__', '__del__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_details', '_email', '_grade', '_name', '_number', 'detail_info', 'student_count']
print(dir(studt2))
print(studt1.__dict__)
# {'_name': 'cho', '_number': 2, '_grade': 3, '_details': {'gender': 'Male', 'score1': 65, 'score2': 44}, '_email': None}
print(studt2.__dict__)
# Doctring - 주석을 출력
print(Student.__doc__)
# Student Class
# Author: sdk
# Date: 2021.04.12
print()
# 실행
studt1.detail_info()
# Current Id : 140202496724944
# student Detail Info : cho None {'gender': 'Male', 'score1': 65, 'score2': 44}
studt2.detail_info()
# 에러
Student.detail_info()
class Student():
"""
Student Class
Author: sdk
Date: 2021.04.12
"""
# 클래스 변수
student_count = 0
def __init__(self, name, number, grade, details, email=None):
# 인스턴스 변수
self._name = name
self._number = number
self._grade = grade
self._details = details
self._email = email
# 클래스 변수에 접근하기
Student.student_count += 1
def __str__(self):
return 'str {}'.format(self._name)
def __repr__(self):
return 'repr {}'.format(self._name)
def detail_info(self):
print('Current Id : {}'.format(id(self)))
print('student Detail Info : {} {} {}'.format(self._name, self._email, self._details))
def __del__(self):
Student.student_count -= 1
# self의 의미
studt1 = Student('cho', 2 ,3, {'gender': 'Male', 'score1': 65, 'score2': 44})
studt2 = Student('chang', 4 ,1, {'gender': 'Female', 'score1': 85, 'score2': 74}, '[email protected]')
# 아이디 값이 다르다.
print(id(studt1)) # 140202496724944
print(id(studt2)) # 140202496724848
# is 는 아이디 값을 비교, == 는 값을 비교
print(studt1._name == studt2._name) # False
print(studt1 is studt2) # False
# dir & __dict__ 확인
print(dir(studt1)) #['__class__', '__del__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_details', '_email', '_grade', '_name', '_number', 'detail_info', 'student_count']
print(dir(studt2))
print(studt1.__dict__)
# {'_name': 'cho', '_number': 2, '_grade': 3, '_details': {'gender': 'Male', 'score1': 65, 'score2': 44}, '_email': None}
print(studt2.__dict__)
# Doctring - 주석을 출력
print(Student.__doc__)
# Student Class
# Author: sdk
# Date: 2021.04.12
print()
# 실행
studt1.detail_info()
# Current Id : 140202496724944
# student Detail Info : cho None {'gender': 'Male', 'score1': 65, 'score2': 44}
studt2.detail_info()
# 에러
Student.detail_info()
インスタンス変数とクラス変数の違いを理解する
dir()
関数と__dict__
の違いを理解するStudent.detail_info()
でエラーが発生した理由を理解します(パラメータがないため)ショッピングモールの作成
ユーザ,商品,注文の3つのappを生成した.
それぞれモデルを構築した.
# 유저 모델
class Fcuser(models.Model):
email = models.EmailField(verbose_name='이메일')
password = models.CharField(max_length=64, verbose_name='비밀번호')
register_date = models.DateTimeField(auto_now_add=True, verbose_name='생성날짜')
def __str__(self):
return self.email
class Meta:
db_table = 'products_user'
verbose_name = '사용자'
verbose_name_plural = '사용자'
# 상품 모델
class Product(models.Model):
name = models.CharField(max_length=256, verbose_name='상품명')
price = models.IntegerField(verbose_name='상품가격')
description = models.TextField(verbose_name='상품설명')
stuck = models.IntegerField(verbose_name='재고')
register_date = models.DateTimeField(auto_now_add=True, verbose_name='등록날짜')
def __str__(self):
return self.name
class Meta:
db_table = 'products_product'
verbose_name = '상품'
verbose_name_plural = '상품'
# 주문 모델
class Order(models.Model):
fcuser = models.ForeignKey('fcuser.Fcuser', on_delete=models.CASCADE, verbose_name='사용자')
product = models.ForeignKey('product.Product', on_delete=models.CASCADE, verbose_name='상품')
quantity = models.IntegerField(verbose_name='수량')
register_date = models.DateTimeField(auto_now_add=True, verbose_name='등록날짜')
def __str__(self):
return str(self.fcuser) + ' ' + str(self.product)
class Meta:
db_table = 'products_order'
verbose_name = '주문'
verbose_name_plural = '주문'
Reference
この問題について(210412 TIL), 我々は、より多くの情報をここで見つけました https://velog.io/@sdk1926/210412-TILテキストは自由に共有またはコピーできます。ただし、このドキュメントのURLは参考URLとして残しておいてください。
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