code: def sqlupdate(table, rowupdate, where):
      
      validate_name(table)
      fields = sorted(rowupdate.keys())
      validate_names(fields)
      values = [rowupdate[field] for field in fields]
      setparts = [field + '=%s' for field in fields]
      setclause = ', '.join(setparts)
      sql = "update {} set ".format(table) + setclause
      (whereclause, wherevalues) = sqlwhere(where)
      if whereclause:
          sql = sql + " where " + whereclause
      return (sql, values + wherevalues)
docs: Generates SQL update table set ...
      Returns (sql, parameters)
  
      >>> sqlupdate('mytable', {'field1': 3, 'field2': 'hello'}, {'id': 5})
      ('update mytable set field1=%s, field2=%s where id=%s', [3, 'hello', 5])