在 Python 中尝试移动 Turtle 时键入错误

Question

我尝试移动乌龟到随机位置来画星星，但是当我运行代码时，我得到：

Traceback (most recent call last): File "so_quick_run.py", line 36, in
main()   File "so_quick_run.py", line 34, in main
move()   File "so_quick_run.py", line 28, in move
alex.goto(rng(), rng())   File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/turtle.py", line 1689, in goto self._goto(Vec2D(*x)) TypeError: type object argument after * must be a sequence, not NoneType

我想我遇到这个问题是因为我的 turtle 的 goto 命令使用了 RNG。

#Import turtle
import turtle
wn = turtle.Screen()
alex = turtle.Turtle()

#Turtle Setting
alex.speed(10)
alex.color("yellow")
wn.bgcolor("black")
wn.screensize(600,600)

#Drawing star
def star(alex):
  for x in range(5):
      alex.pendown()
      alex.forward(50)
      alex.right(144)
      alex.penup()

#Randon Number Generator
import random
def rng():
  for i in range(1):
    random.randint(-250,250)

#Moving turtle
def move():
    alex.penup()
    alex.goto(rng(), rng())
    alex.pendown()

#Main funaton
def main():
    for i in range(10):
        move()
        star(alex)
main()

#Ending the loop
wn.mainloop()

Answer 1

正如@DYZ 提到的那样，您没有 return 在 rng() 中输入任何内容，只是 return 您生成的随机数：

#Randon Number Generator
import random
def rng():
    for i in range(1):
        return random.randint(-250,250)

在 Python 中尝试移动 Turtle 时键入错误

Type Error when trying to move Turtle in Python

python

turtle-graphics