numpy.core.defchararray.zfill

numpy.core.defchararray.zfill(a, width) [source]

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

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https://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.core.defchararray.zfill.html