code: def encode_row(fields):
      
      # NOTE: str(f) only works for Python3
      unicode_fields = [unicode(f) for f in fields]
      escaped_fields = map(escape, unicode_fields)
      return _field_delimiter.join(escaped_fields)
docs: Encode a list of column values into a [incr tsdb()] profile line.
  
      Encoding involves escaping special characters for each value, then
      joining the values into a single string with the field delimiter
      (`"@"` by default). It does not fill in default values (see
      make_row()).
  
      Args:
          fields: a list of column values
      Returns:
          A [incr tsdb()]-encoded string