human
I wrote the below code

    from .entity import GeometryEntity
    from .point import Point
    from .line import Segment
    from .polygon import Polygon
    polygon = kwargs.get('polygon', True)
    p = set()
    for e in args:
        if (not isinstance(e, GeometryEntity)):
            try:
                e = Point(e)
            except NotImplementedError:
                raise ValueError(('%s    is    not    a    GeometryEntity    and    cannot    be    made    into    Point' % str(e)))
        if isinstance(e, Point):
            p.add(e)
        elif isinstance(e, Segment):
            p.update(e.points)
        elif isinstance(e, Polygon):
            p.update(e.vertices)
        else:
            raise NotImplementedError(('Convex    hull    for    %s    not    implemented.' % type(e)))
    if any(((len(x) != 2) for x in p)):
        raise ValueError('Can    only    compute    the    convex    hull    in    two    dimensions')
    p = list(p)
    if (len(p) == 1):
        return (p[0] if polygon else (p[0], None))
    elif (len(p) == 2):
        s = Segment(p[0], p[1])
        return (s if polygon else (s, None))
    def _orientation(p, q, r):
        'Return    positive    if    p-q-r    are    clockwise,    neg    if    ccw,    zero    if\n                                collinear.'
        return (((q.y - p.y) * (r.x - p.x)) - ((q.x - p.x) * (r.y - p.y)))
    U = []
    L = []
    try:
        p.sort(key=(lambda x: x.args))
    except TypeError:
        raise ValueError('The    points    could    not    be    sorted.')
    for p_i in p:
        while ((len(U) > 1) and (_orientation(U[(-2)], U[(-1)], p_i) <= 0)):
            U.pop()
        while ((len(L) > 1) and (_orientation(L[(-2)], L[(-1)], p_i) >= 0)):
            L.pop()
        U.append(p_i)
        L.append(p_i)
    U.reverse()
    convexHull = tuple((L + U[1:(-1)]))
    if (len(convexHull) == 2):
        s = Segment(convexHull[0], convexHull[1])
        return (s if polygon else (s, None))
    if polygon:
        return Polygon(*convexHull)
    else:
       ...

What's a good function header?

=====
Write me a Python code to compute    the    convex    hull    in    two    dimensions')?
assistant
#Here is Python code to compute    the    convex    hull    in    two    dimensions')
.

def convex_hull(*args, **kwargs):