input: Write a function that rewrites the given SQL query into Python code using the sqlite3 library. The function should accept the database name, table name, and the category as parameters and return the results of the query. If the table or category does not exist, raise an appropriate exception. The function should also handle the connection and cursor objects properly.
  
  def rewrite_sql_to_python(db_name, table_name, category):
      import sqlite3
  
      try:
          conn = sqlite3.connect(db_name)
          cursor = conn.cursor()
          
          cursor.execute(f"SELECT * FROM {table_name} WHERE category = ?", (category,))
          
          result = cursor.fetchall()
          for row in result:
              print(row)
          
          conn.close()
          return result
      except sqlite3.OperationalError as e:
          print(f"Error: {e}")
          return None
  
  assert rewrite_sql_to_python('movies.db', 'Movies', 'horror') is not None
  assert rewrite_sql_to_python('movies.db', 'Movies', 'science fiction') is not None
  assert rewrite_sql_to_python('movies.db', 'Movies', 'nonexistent category') is None
output: 
  def rewrite_sql_to_python(db_name, table_name, category):
      import sqlite3
  
      try:
          conn = sqlite3.connect(db_name)
          cursor = conn.cursor()
          
          cursor.execute(f"SELECT * FROM {table_name} WHERE category = ?", (category,))
          
          result = cursor.fetchall()
          conn.close()
          return result
      except sqlite3.OperationalError as e:
          raise sqlite3.OperationalError(f"Error: {e}")