input: 
  def sql_to_dataframe(sql_query: str, conn) -> pd.DataFrame:
      """Convert a given SQL query into a Pandas DataFrame.
      >>> sql_to_dataframe("SELECT * FROM book;", conn).head()
      """
      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)