I am not at this point interested in an efficient way of producing
concentric circles: I want to see what I have to do to get this way to
work
为了解决OP的问题，对其原始代码进行更改以使其正常工作是很简单的：turtle_pos(trl, [trl.xcor() + mv, trl.ycor() - mv], 1)
trl.circle(j * radius)
变成：turtle_pos(trl, [trl.xcor(), trl.ycor() - mv], 1)
trl.circle(j * mv + radius)
包含上述修复和一些样式更改的完整代码：import turtle
def turtle_pos(art, posxy, lift):
if lift:
art.penup()
art.setposition(posxy)
art.pendown()
def drawit(tshape, tcolor, pen_color, pen_thick, scolor, radius, mv):
window = turtle.Screen() # Request a screen
window.bgcolor(scolor) # Set its color
#...code that defines the turtle trl
trl = turtle.Turtle(tshape)
trl.pencolor(pen_color)
trl.fillcolor(tcolor) # not filling but makes body of turtle this color
trl.width(pen_thick)
for j in range(10):
turtle_pos(trl, (trl.xcor(), trl.ycor() - mv), True)
trl.circle(j * mv + radius)
window.mainloop()
drawit("turtle", "purple", "green", 4, "black", 20, 30)
