old_contents: #!bin/env python
  
  import asyncpg
  
  class PGDB:
      def __init__(self, db_conn):
          self.db_conn = db_conn
  
      async def fetch_user_info(self, member_id: int, column: str):
          query = f'''SELECT {column} FROM user_info WHERE member_id = {member_id};'''
          return await self.db_conn.fetchval(query)
  
      async def insert_user_info(self, member_id: int, column: str, col_value):
          execute = (
              f'''INSERT INTO user_info (member_id, {column}) 
                      VALUES ({member_id}, {col_value})
                      ON CONFLICT (member_id)
                          DO UPDATE SET {column} = {col_value};''')
          await self.db_conn.execute(execute)
  
new_contents: #!bin/env python
  
  import asyncpg
  
  class PGDB:
      def __init__(self, db_conn):
          self.db_conn = db_conn
  
      async def fetch_user_info(self, member_id: int, column: str):
          query = f'''SELECT {column} FROM user_info WHERE member_id = {member_id};'''
          return await self.db_conn.fetchval(query)
  
      async def insert_user_info(self, member_id: int, column: str, col_value):
          execute = (
              f"""INSERT INTO user_info (member_id, {column}) 
                      VALUES ({member_id}, {col_value})
                      ON CONFLICT (member_id)
                          DO UPDATE SET {column} = {col_value};""")
          await self.db_conn.execute(execute)
  
subject: change quote style for testing