AttributeError: 'int' object has no attribute 'fd'

Question

我正在阅读 Python 教程，其中一个练习让我卡住了。练习的描述是："Read the following function and see if you can figure out what it does. Then run it." 所以我不能真正告诉你它在做什么，我还在努力。

前两行是我自己写的，是教程里的复制粘贴。这是代码：

import turtle

t = turtle.Turtle()
turtle.mainloop()

def draw(t, length, n):
    if n == 0:
        return
    angle = 50
    t.fd(length*n)
    t.lt(angle)
    draw(t, length, n-1)
    t.rt(2*angle)
    draw(t, length, n-1)
    t.lt(angle)
    t.bk(length*n)

draw(5, 10, 15)

给出回溯：

> Traceback (most recent call last):   File
> "D:\Directory\Python\Projects\Learning python\Exercises\Exercise
> 5.14.5.py", line 18, in <module>
>     draw(5, 10, 15)   File "D:\Directory\Python\Projects\Learning python\Exercises\Exercise 5.14.5.py", line 10, in draw
>     t.fd(length*n) AttributeError: 'int' object has no attribute 'fd'

Answer 1

你得到这个错误的原因是因为第一个参数是5，所以变量t在函数中的值是5。然后代码尝试调用 5.fd(length*n)。调用draw时将第一个参数切换为t:

draw(t, 10, 15)

AttributeError: 'int' object has no attribute 'fd'

AttributeError: 'int' object has no attribute 'fd'

turtle-graphics

attributeerror

python-3.x