How to use the pdfplumber.display.COLORS function in pdfplumber

import PIL.Image
import PIL.ImageDraw
import wand.image
import sys, os
from io import BytesIO
from pdfplumber import utils
from pdfplumber.table import TableFinder

class COLORS(object):
    RED = (255, 0, 0)
    GREEN = (0, 255, 0)
    BLUE = (0, 0, 255)
    TRANSPARENT = (0, 0, 0, 0)

DEFAULT_FILL = COLORS.BLUE + (50,)
DEFAULT_STROKE = COLORS.RED + (200,)
DEFAULT_STROKE_WIDTH = 1
DEFAULT_RESOLUTION = 72

def get_page_image(pdf_path, page_no, resolution):
    """
    For kwargs, see http://docs.wand-py.org/en/latest/wand/image.html#wand.image.Image
    """
    page_path = "{0}[{1}]".format(pdf_path, page_no)
    with wand.image.Image(filename=page_path, resolution=resolution) as img:
        if img.alpha_channel:
            img.background_color = wand.image.Color('white')
            img.alpha_channel = 'background'
        with img.convert("png") as png:
            im = PIL.Image.open(BytesIO(png.make_blob()))
            if "transparency" in im.info:
                converted = im.convert("RGBA").convert("RGB")

bbox = bbox_or_obj
        else:
            obj = bbox_or_obj
            bbox = (obj["x0"], obj["top"], obj["x1"], obj["bottom"])

        x0, top, x1, bottom = bbox
        half = self.decimalize(stroke_width / 2)
        x0 += half
        top += half
        x1 -= half
        bottom -= half

        self.draw.rectangle(
            self._reproject_bbox((x0, top, x1, bottom)),
            fill,
            COLORS.TRANSPARENT
        )

        if stroke_width > 0:
            segments = [
                ((x0, top), (x1, top)), # top
                ((x0, bottom), (x1, bottom)), # bottom
                ((x0, top), (x0, bottom)), # left
                ((x1, top), (x1, bottom)), # right
            ]
            self.draw_lines(
                segments,
                stroke=stroke,
                stroke_width=stroke_width
            )
        return self

def debug_tablefinder(self, tf={}):
        if isinstance(tf, TableFinder):
            pass
        elif isinstance(tf, dict):
            tf = self.page.debug_tablefinder(tf)
        else:
            raise ValueError("Argument must be instance of TableFinder or a TableFinder settings dict.")

        for table in tf.tables:
            self.debug_table(table)

        self.draw_lines(tf.edges, stroke_width=1)

        self.draw_circles(tf.intersections.keys(),
            fill=COLORS.TRANSPARENT,
            stroke=COLORS.BLUE + (200,),
            radius=3)
        return self