code: def draw_circle(self, center, radius, array, value, mode="set"):
          
          ri, ci = draw.circle(center[0], center[1],
                               radius=radius,
                               shape=array.shape)
          if mode == "add":
              array[ri, ci] += value
          elif mode == "set":
              array[ri, ci] = value
          else:
              raise ValueError("draw_circle mode must be 'set' or 'add' but {} used".format(mode))
          return ri, ci, array[ri,ci]
docs: Draws a circle of specified radius on the input array and fills it with specified value
          :param center: a tuple for the center of the circle
          :type center: tuple (x,y)
          :param radius: how many pixels in radius the circle is
          :type radius: int
          :param array: image to draw circle on
          :type array: size (m,n) numpy array
          :param value: what value to fill the circle with
          :type value: float
          :param mode: if "set" will assign the circle interior value, if "add" will add the value to the circle interior,
              throws exception otherwise
          :type mode: string, either "set" or "add"
          :return: updates input array