How to use the desert.Desert function in desert

def main(arg):

  with Desert(1000, show=True, verbose=VERBOSE)\
      .init(fg=black(0.001),
            bg=white()) as c:

    density = 0.15
    num = 20
    rad = 0.35

    noise = 0.00005
    spl = []

    for _ in range(20):
      a = sorted(random(num)*TWOPI)
      spl.append(0.5 + column_stack((cos(a), sin(a)))*rad)

    res = []
    for i in range(1, 4000000):

def main(arg):

  imsize = 1000
  with Desert(imsize, verbose=VERBOSE)\
      .init(fg=rgb(1.0, 0.0, 0.0, 0.1),
            bg=white()) as desert:

    draw = desert.draw

    draw([box(0.15, (0.3, 0.3), 2.0),
          box(0.2, (0.2, 0.5), 0.1),
          box((0.05, 0.5), (0.25, 0.9), 1.0),
          box((0.3, 0.2), (0.1, 0.9), 2.0)])

    desert.show()

    desert.set_fg(rgb(0, 0.5, 0.5, 0.1))

    draw([box(0.15, (0.5, 0.3), 2.0),
          box(0.2, (0.5, 0.5), 0.1),

def main(arg):

  imsize = 1000
  with Desert(imsize, verbose=VERBOSE)\
      .init(fg=black(0.1),
            bg=white()) as desert:

    num = 20

    xya = random((num, 2))
    xyb = random((num, 2))

    stacka = []
    stackb = []

    drift = in_circle(1, 0, 0, 0.00001)

    for i in range(1, 100000):
      xya += in_circle(num, 0, 0, 0.001) + drift
      xyb += in_circle(num, 0, 0, 0.001) + drift

def main(arg):

  with Desert(1000, show=True, verbose=VERBOSE)\
      .init(fg=black(0.001),
            bg=white()) as c:

    density = 0.02
    a = random(2)*TWOPI
    acc = zeros(2)
    noise = 0.000000005
    rad = 0.45

    resa = []
    resb = []

    for i in range(4000000):
      a += acc
      acc += (1-2*random(2))*noise

def __enter__(self):
    print('>> running erosion worker.')
    print('>> listening at: {:s}/{:s}.'.format(self.con, self.chan))
    print('>> resolution: ({:d} {:d}).'.format(self.imsize, self.imsize))
    print('>> gsamples: ', self.gsamples)
    print('>> show: ', self.show)

    self.red = Redis(self.host, self.port)
    self.desert = Desert(self.imsize,
                         show=self.show,
                         gsamples=self.gsamples,
                         verbose=self.verbose).init()
    return self