input: 
  import sqlite3
  
  class Model:
  
    def __init__(self):
      self.conn = sqlite3.connect(":memory:")
      self.cursor = self.conn.cursor()
  
    def create(self,name):
      self.cursor.execute(
  			"CREATE TABLE IF NOT EXISTS Models (name TEXT)"
  		)
      self.cursor.execute(
  			"INSERT INTO Models(name) VALUES (?)",
  			(name,),
  		)
      self.conn.commit()
  
    def read(self):
      self.cursor.execute("SELECT * FROM Models")
      return self.cursor.fetchall()
  
    def update(self,name):
      self.cursor.execute(
  			"UPDATE Models SET name = ? WHERE name = ?", 
  			(name, name,),
  		)
      self.conn.commit()
    
    def delete(self, name):
      self.cursor.execute(
  			"DELETE FROM Models WHERE name = ?",
  			(name,),
  		)
      self.conn.commit()
  
  ### Example Usage:
  >>> model = Model()
  >>> model.create("InitialValue")
  >>> model.read()
  [('InitialValue',)]
  >>> model.update("NewValue")
  >>> model.read()
  [('NewValue',)]
  >>> model.delete("NewValue")
  >>> model.read()
  []
  
output:     
      def close(self):
          self.conn.close()
  