input: from typing import List
  
  def convert_sql_to_df(sql_statement: str, conn) -> pd.DataFrame:
      """ Converts a given SQL statement into a Pandas DataFrame.
      >>> convert_sql_to_df("SELECT * FROM book;", conn)
      >>> print(df)
           id  title           author  year
      0     1  Book1  Author1  2000
      1     2  Book2  Author2  2001
      """
      import pandas as pd
      return pd.read_sql_query(sql_statement, conn)
output:     import pandas as pd
      return pd.read_sql_query(sql_statement, conn)