Question

我正在编写一个程序，需要一只乌龟移动到另一只乌龟。但是很简单：

turtle.goto(other_turtle.pos())

其中turtle和other_turtle是两个已定义的海龟

这不起作用，因为它说other_turtle.pos()是一个方法，并且没有定义方法和浮点数之间的减法。然后我继续尝试将other_turtle.pos()更改为float(other_turtle.pos())。那就是错误地说你不能浮动一个方法。

我的问题：这可能是这样做还是由于蟒蛇本身的局限性不可能？

代码：

def turtle_clone(clone_nmb):
    return [turtle.Turtle() for i in range(clone_nmb)]

def straight_curve(turtle,number_of_arms,number_of_points,colors):
    turtles = turtle_clone(2)
    turtles[0].hideturtle()
    turtles[1].hideturtle()
    turtles[0].color(colors[0])
    turtles[1].color(colors[0])
    pos = 0
    for i in range(number_of_arms):
        turtles[0].setheading(pos)
        turtles[0].forward(5)
        turtles[1].setheading(pos+(360/number_of_arms))
        turtles[1].forward(5*number_of_points)
        turtles[1].right(180)
        for i in range(number_of_points):
            turtles[0]
            turtle.penup()
            turtle.goto(turtles[0].xcor,turtles[0].ycor)
            turtle.pendown()
            turtle.goto(turtles[1].xcor,turtles[1].ycor)
            turtles[0].forward(5)
            turtles[1].forward(5)
        pos += 360/number_of_arms
        turtles[0].goto(0,0)

错误讯息：

Traceback (most recent call last):
  File "C:\Users\gularson\Documents\Garrett\Messing Around\turtle_functions.py", line 97, in <module>
    straight_curve(turt,5,30,["white"])
  File "C:\Users\gularson\Documents\Garrett\Messing Around\turtle_functions.py", line 87, in straight_curve
    turtle.goto(turtles[0].xcor,turtles[0].ycor)
  File "C:\Users\gularson\Documents\Garrett\Python\lib\turtle.py", line 1776, in goto
    self._goto(Vec2D(x, y))
  File "C:\Users\gularson\Documents\Garrett\Python\lib\turtle.py", line 3165, in _goto
    diff = (end-start)
  File "C:\Users\gularson\Documents\Garrett\Python\lib\turtle.py", line 262, in __sub__
    return Vec2D(self[0]-other[0], self[1]-other[1])
TypeError: unsupported operand type(s) for -: 'method' and 'float'

Answer 1

表达式：

turtle.goto(other_turtle.pos())

确实有效。以下运行没有错误：

import turtle

other_turtle = turtle.Turtle()

turtle.goto(other_turtle.pos())

turtle.done()

但是，当然，它并不是很有趣（在（0,0）处将乌龟移到另一只乌龟的顶部（0,0），但它是合法的。）所以必须有别的东西绊倒你。

您在代码中实际写的内容是：

turtle.goto(other_turtle.xcor, other_turtle.ycor)

turtle.goto(turtles[0].xcor,turtles[0].ycor)

这会导致您报告的错误，因为您正在传递方法xcor和ycor而不是调用它们。应该是：

turtle.goto(other_turtle.xcor(), other_turtle.ycor())

turtle.goto(turtles[0].xcor(), turtles[0].ycor())

或您询问的原始代码：

turtle.goto(other_turtle.pos())

turtle.goto(turtles[0].pos())

本来可以。

将一只乌龟移到另一只乌龟

1 个答案: