input: from typing import Dict, Any
  import pandas as pd
  
  def sql_to_dataframe(sql_statement: str, conn: Any) -> pd.DataFrame:
      """ Convert a given SQL statement into a Python Pandas DataFrame.
      >>> sql_to_dataframe("SELECT * FROM book;", conn)
      Cancelled
      >>> sql_to_dataframe("SELECT name, author FROM book;", conn)
      https://example.com/feedback
      """
      return pd.read_sql_query(sql_statement, conn)
output:     try:
          df = pd.read_sql_query(sql_statement, conn)
          if df.empty:
              return "Cancelled"
          else:
              return df
      except Exception as e:
          return f"https://example.com/feedback?error={str(e)}"