是否可以在类中创建画布

Question

我目前正在开展一个项目，我必须有一个由点组成的网格...... 似乎该类的代码是正确的，因为没有错误消息。 可能是因为你无法在课堂内创建画布吗？ 谢谢你的帮助。 这是代码：

from tkinter import *

root = Tk()

class grid():

    def createcanvas(self, master, width, height):
        self.canvas = Canvas(master, width=width, height=height)
        return(self.canvas)

    def createlabel(self, master, textu):
        self.l = Label(self.c, text=textu)
        self.l.pack()

    def createpoints(self, master, gridsize): # gridsize format '8X8'
        gridsize = gridsize.split('X')

        for i in range(len(gridsize)):
            gridsize[i] = int(gridsize[i]) #[8,8] for example --> x,y coordinates
        spx = 0
        spy = int(canvas['height'])
        for i in range(gridsize[1]):
            for j in range(gridsize[0]):
                master.create_oval(spx, spy, spx+5, spy+5)
                spx = spx + (int(canvas['height'])/gridsize[0])
            spx = 0
            spy = spy - (int(canvas['height'])/gridsize[1])



canvas = grid()
canvas = canvas.createcanvas(root, 600, 600)
a = grid()
a.createpoints(canvas, '16X16')

root.mainloop()