Сделали заготовку класса для ORM системы

main.py

@@ -0,0 +1,63 @@
+import sqlite3
+
+db_name = 'mydb.db'
+
+class User:
+    def __init__(self,name,email,age):
+        self.__id = None
+        self.__name = name
+        self.__email = email
+        self.__age = age
+
+    @property
+    def name(self):
+        return self.__name
+    @name.setter
+    def name(self,value):
+        self.__name = value
+        
+    @property
+    def email(self):
+        return self.__email
+
+    @email.setter
+    def email(self,value):
+        if '@' in value:
+            self.__email = value
+        else:
+            raise ValueError('Не корректный адрес почты')
+    @property
+    def age(self):
+        return self.__age
+    @age.setter
+    def age(self,value):
+        if 0 <= value <= 120:
+            self.__age = value
+        else:
+            raise ValueError('Неправильно указан возраст')
+        
+    def save(self):
+        conn = sqlite3.connect(db_name)
+        cursor = conn.cursor()
+        property_list = [f"{k}" for k, v in User.__dict__.items() if isinstance(v, property)]
+        if '_User__id' in self.__dict__.keys():
+            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 {User.__name__} SET {update_string} WHERE id = ?"
+            print(query,update_values)
+        else:
+            property_count = ('?,'*len(property_list))[:-1] #','.join(['?' for _ in range(len(property_list))])
+            property_names = ','.join(property_list)
+            property_values = [getattr(self,p) for p in property_list]
+            query = f"INSERT INTO {User.__name__}({property_names}) VALUES({property_count})"
+            print(query,property_values)
+            cursor.execute(query,property_values)
+            conn.commit()
+            self.__id = cursor.lastrowid
+        conn.close()
+#print(User.__dict__)
+
+user1 = User('Igor','igor@example.com',44)
+user1.save()
+user1.age = 55
+user1.save()