Сделали ORM систему с типами полей

main.py

@@ -1,45 +1,127 @@
-import requests
-from bs4 import BeautifulSoup
-import re
+import sqlite3
 
-url = 'https://msk.top-academy.ru/blog'
+db_name = 'mydb.db'
 
-class BlogArticle:
-    ls = list()
-    def __init__(self,title,text):
-        self.title = title
-        self.text = text
-        BlogArticle.ls.append(self)
-    @classmethod
-    def count(cls):
-        return len(cls.ls)
+class Field:
+    def __init__(self,name,column_type):
+        self.name = name
+        self.type = column_type
+    def __str__(self):
+        return f'{self.name}:{self.type}'
+
+class IntegerField(Field):
+    def __init__(self,name):
+        super().__init__(name,'INTEGER')
+
+class StringField(Field):
+    def __init__(self,name):
+        super().__init__(name,'TEXT')
     
-    def to_dict(self):
-        return {'title': self.title, 'text':self.text}
+class ModelMeta(type):
+    def __new__(cls, name, bases, attrs):
+        if name == 'BaseModel':
+            return super().__new__(cls,name,bases,attrs)
+
+        fields = dict()
+        for k,v in attrs.items():
+            if isinstance(v,Field):
+                fields[k] = v
+
+        attrs['_fields'] = fields
+        return super().__new__(cls,name,bases,attrs)
+        
+
+class BaseModel(metaclass=ModelMeta):
+    def __init__(self,**kwargs):
+        for k,v in kwargs.items():
+            setattr(self,k,v)   #{'name': 'Alex'} self.name = 'Alex'
 
     @classmethod
-    def from_dict(cls,d):
-        BlogArticle(d['title'],d['text'])
+    def get_by_id(cls,id):
+        conn = sqlite3.connect(db_name)
+        cursor = conn.cursor()
+        property_list = ['id']+[f"{k}" for k, v in cls.__dict__.items() if isinstance(v, property)]
+        property_string = ','.join(property_list)
+        query = f"SELECT {property_string} FROM {cls.__name__} WHERE id = ?"
+        cursor.execute(query,(id,))
+        result = cursor.fetchone()
+        property_dict = dict()
+        for index in range(len(property_list)):
+            property_dict[property_list[index]] = result[index]
+        conn.close()
+        return cls(**property_dict)
 
-def scan(i):
-    headers = {
-        'User-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36'
-        }
-    response = requests.get(
-        url + (f'?page={i}' if i>1 else ''),
-        headers=headers
-    )
-    html = response.text
-    soup = BeautifulSoup(html,'html.parser')
-    result = soup.find_all("div", class_='styles_cardBody__qP0jN')
-    for el in result:
-        par = el.find_all("p")
-        BlogArticle(par[0].text,par[1].text)
+    def save(self):
+        conn = sqlite3.connect(db_name)
+        cursor = conn.cursor()
 
-if __name__ == '__main__':
-    BlogArticle.from_dict({'title':'Заголовок','text':'Текст статьи'})
-    #for i in range(3):
-        #scan(i)
-    print(BlogArticle.count())
-    for i in range(1):
-        print(BlogArticle.ls[i].to_dict())
+        fields = []
+        values = []
+        for name, field in self._fields.items():
+            fields.append(field.name)
+            values.append(getattr(self,name,None))
+
+        query =f'''INSERT INTO {self.__class__.__name__.lower()}({','.join(fields)})
+                    VALUES({','.join(['?']*len(values))})'''
+
+        print(query,values)
+        conn.close()
+'''
+        property_list = [f"{k}" for k, v in self.__class__.__dict__.items() if isinstance(v, property)]
+        
+        if self.__id != None:
+            update_string = ','.join([f'`{p_name}`= ? ' for p_name in property_list])
+            update_values = [getattr(self,p) for p in property_list] + [self.__id]
+            query = f"UPDATE {self.__class__.__name__} SET {update_string} WHERE id = ?"
+            print(query,update_values)
+            cursor.execute(query,update_values)
+            conn.commit()
+        else:
+            property_count = ('?,'*len(property_list))[:-1]
+            property_names = ','.join(property_list)
+            property_values = [getattr(self,p) for p in property_list]
+            query = f"INSERT INTO {self.__class__.__name__}({property_names}) VALUES({property_count})"
+            cursor.execute(query,property_values)
+            conn.commit()
+            self.__id = cursor.lastrowid
+'''
+
+def validate_email(func):
+    def wrapper(self,*args,**kwargs):
+        if hasattr(self,'email'):
+            if '@' not in self.email:
+                raise ValueError('Некоректный email')
+            
+        return func(self,*args,**kwargs)
+    return wrapper
+
+class User(BaseModel):
+    id = IntegerField('id')
+    name = StringField('name')
+    age = Field('age','REAL')
+    email = StringField('email')
+
+    @validate_email
+    def save(self):
+        super().save()
+
+'''
+class Product(BaseModel):
+    def __init__(self,name,category,price,id=None):
+        super().__init__(id)
+        self.__name = name
+        self.__category = category
+        self.__price = price
+    @property
+    def name(self):
+        return self.__name
+    @property
+    def category(self):
+        return self.__category
+    @property
+    def price(self):
+        return self.__price
+'''
+
+user1 = User(name='John',age=18, email='john@example.com')
+user1.save()