您可以使用透明图像来模拟结果。使用Pillow创建透明的图像，然后用canvas.create_image(...)画它。下面是一个示例代码：
from tkinter import *
from PIL import Image, ImageTk
root = Tk()
images = [] # to hold the newly created image
def create_rectangle(x1, y1, x2, y2, **kwargs):
if 'alpha' in kwargs:
alpha = int(kwargs.pop('alpha') * 255)
fill = kwargs.pop('fill')
fill = root.winfo_rgb(fill) + (alpha,)
image = Image.new('RGBA', (x2-x1, y2-y1), fill)
images.append(ImageTk.PhotoImage(image))
canvas.create_image(x1, y1, image=images[-1], anchor='nw')
canvas.create_rectangle(x1, y1, x2, y2, **kwargs)
canvas = Canvas(width=300, height=200)
canvas.pack()
create_rectangle(10, 10, 200, 100, fill='blue')
create_rectangle(50, 50, 250, 150, fill='green', alpha=.5)
create_rectangle(80, 80, 150, 120, fill='#800000', alpha=.8)
root.mainloop()
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