input: 
  def sql_to_dataframe(sql_query: str, conn) -> pd.DataFrame:
      """Convert a given SQL statement into a Python Pandas DataFrame.
      
      >>> sql_query = "SELECT * FROM book;"
      >>> conn = some_connection_object  # This should be a placeholder for an actual connection object
      >>> df = sql_to_dataframe(sql_query, conn)
      >>> type(df)
      <class 'pandas.core.frame.DataFrame'>
      """
      import pandas as pd
      return pd.read_sql_query(sql_query, conn)
  
output:     import pandas as pd
      return pd.read_sql_query(sql_query, conn)