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# numpy.core.defchararray.zfill

`numpy.core.defchararray.``zfill`(a, width)

  Return the numeric string left-filled with zeros

  Calls str.zfill element-wise.

  Parameters: | a : array_like, {str, unicode} Input array. width : int Width of string to left-fill elements in a.
  Returns: | out : ndarray, {str, unicode} Output array of str or unicode, depending on input type

  See also

  `str.zfill`