_tkinter.TclError：无效的命令名称“.!canvas”在海龟图形中的错误

Question

I'm trying to create a polygon using turtle graphics but I keep on running to this error

self.tk.call((self._w, 'coords') + args))] _tkinter.TclError: invalid command name ".!canvas

"

import turtle
bob = turtle.Turtle()
def polygon(t,length,n):
    angle = 360%n
    for i in range(n):
        t.fd(length)
        t.lt(angle)

polygon(bob,70,7)

Answer 1

I can't reproduce your error, we may need to see more of it to understand the problem. However, code-wise, I would have expected / (floating division) instead of % (modulus remainder):

import turtle

def polygon(t, length, n):
    angle = 360 / n

    for _ in range(n):
        t.forward(length)
        t.left(angle)

bob = turtle.Turtle()
polygon(bob, 70, 7)

turtle.done()