input: def sql_to_pandas_df(sql_statement: str, conn) -> pd.DataFrame:
      """ Convert a given SQL statement into a Python Pandas DataFrame.
      >>> sql_to_pandas_df("SELECT * FROM book;", conn).head()
      ...
             id category       name  price
      ...
             0       1     Sci-Fi    Dune  15.99
             1       2    Fantasy  LOTR1  8.99
             2       3  Mystery     1984  12.99
      """
      return pd.read_sql_query(sql_statement, conn)
output:     return pd.read_sql_query(sql_statement, conn)