defchararray.py 文件源码

def center(a, width, fillchar=' '):
    """
    Return a copy of `a` with its elements centered in a string of
    length `width`.

    Calls `str.center` element-wise.

    Parameters
    ----------
    a : array_like of str or unicode

    width : int
        The length of the resulting strings
    fillchar : str or unicode, optional
        The padding character to use (default is space).

    Returns
    -------
    out : ndarray
        Output array of str or unicode, depending on input
        types

    See also
    --------
    str.center

    """
    a_arr = numpy.asarray(a)
    width_arr = numpy.asarray(width)
    size = long(numpy.max(width_arr.flat))
    if numpy.issubdtype(a_arr.dtype, numpy.string_):
        fillchar = asbytes(fillchar)
    return _vec_string(
        a_arr, (a_arr.dtype.type, size), 'center', (width_arr, fillchar))