input: Write a function to translate an SQL query into a Python function using the sqlite3 library. The function should connect to a database, execute the given SQL query, fetch the results, and print each row of the result. If the database name or the SQL query is not provided, the function should return an error message.
  
  def translate_sql_to_python(db_name='movies.db', sql_query="SELECT * FROM Movies WHERE category = 'horror'"):
      if not db_name or not sql_query:
          return "Error: Database name and SQL query are required."
      
      try:
          import sqlite3
          conn = sqlite3.connect(db_name) 
          cursor = conn.cursor()
          cursor.execute(sql_query)
          result = cursor.fetchall()
          for row in result:
              print(row)
          conn.close()
      except Exception as e:
          return str(e)
  
  assert translate_sql_to_python() is None
  assert translate_sql_to_python('nonexistent.db') is not None
  assert translate_sql_to_python(sql_query="INVALID QUERY") is not None
  assert translate_sql_to_python(db_name="", sql_query="") == "Error: Database name and SQL query are required."
output: def translate_sql_to_python(db_name='movies.db', sql_query="SELECT * FROM Movies WHERE category = 'horror'"):
      if not db_name or not sql_query:
          return "Error: Database name and SQL query are required."
      
      try:
          import sqlite3
          conn = sqlite3.connect(db_name) 
          cursor = conn.cursor()
          cursor.execute(sql_query)
          result = cursor.fetchall()
          for row in result:
              print(row)
          conn.close()
      except Exception as e:
          return str(e)