def zfill(a, width):
a_arr = numpy.asarray(a)<EOL>width_arr = numpy.asarray(width)<EOL>size = long(numpy.max(width_arr.flat))<EOL>return _vec_string(<EOL>a_arr, (a_arr.dtype.type, size), '<STR_LIT>', (width_arr,))<EOL>
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