input: def sql_to_dataframe(sql_statement: str, conn) -> pd.DataFrame:
      """Convert a given SQL statement into a Python Pandas DataFrame.
      >>> sql_to_dataframe("SELECT * FROM book;", conn)
        id          title  author_id
      0  1       Sample1          1
      1  2       Sample2          2
      2  3       Sample3          3
      """
output:     return pd.read_sql(sql_statement, conn)