human
I wrote the below code

    im.load()
    if (im.mode == 'L'):
        operator = (8, 1, 'image')
    elif (im.mode == 'RGB'):
        operator = (8, 3, 'false    3    colorimage')
    elif (im.mode == 'CMYK'):
        operator = (8, 4, 'false    4    colorimage')
    else:
        raise ValueError('image    mode    is    not    supported')
    class NoCloseStream(object, ):
        def __init__(self, fp):
            self.fp = fp
        def __getattr__(self, name):
            return getattr(self.fp, name)
        def close(self):
            pass
    base_fp = fp
    if (fp != sys.stdout):
        fp = NoCloseStream(fp)
        if (sys.version_info[0] > 2):
            fp = io.TextIOWrapper(fp, encoding='latin-1')
    if eps:
        fp.write('%!PS-Adobe-3.0    EPSF-3.0\n')
        fp.write('%%Creator:    PIL    0.1    EpsEncode\n')
        fp.write(('%%%%BoundingBox:    0    0    %d    %d\n' % im.size))
        fp.write('%%Pages:    1\n')
        fp.write('%%EndComments\n')
        fp.write('%%Page:    1    1\n')
        fp.write(('%%ImageData:    %d    %d    ' % im.size))
        fp.write(('%d    %d    0    1    1    "%s"\n' % operator))
    fp.write('gsave\n')
    fp.write('10    dict    begin\n')
    fp.write(('/buf    %d    string    def\n' % (im.size[0] * operator[1])))
    fp.write(('%d    %d    scale\n' % im.size))
    fp.write(('%d    %d    8\n' % im.size))
    fp.write(('[%d    0    0    -%d    0    %d]\n' % (im.size[0], im.size[1], im.size[1])))
    fp.write('{    currentfile    buf    readhexstring    pop    }    bind\n')
    fp.write((operator[2] + '\n'))
    if hasattr(fp, 'flush'):
        fp.flush()
    ImageFile._save(im, base_fp, [('eps', ((0, 0) + im.size), 0, None)])
    fp.write('\n%%%%EndBinary\n')
    fp.write('grestore    end\n')
    if hasattr(fp, 'flush'):
        fp.flush()

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def _save(im, fp, filename, eps=1):