# xarray.core.accessor_str.StringAccessor.zfill

`StringAccessor.``zfill`(width)

  Pad strings in the array by prepending ‘0’ characters.

  Strings in the array are padded with ‘0’ characters on the left of the string to reach a total string length width. Strings in the array with length greater or equal to width are unchanged.

  Parameters: | width (int) – Minimum length of resulting string; strings with length less than width be prepended with ‘0’ characters.
  Returns: | filled
  Return type: | same type as values