Question

我希望我的程序在按下Page UP键时增加Python's pensize。我尝试了以下方法：

#!/usr/bin/env python3
import turtle
wn=turtle.Screen()
wn.title('Control using first letter of desired action')
py=turtle.Turtle()
py.color('blue')
size=1
def front():
    py.fd(90)
def back():
    py.bk(90)
def right():
    py.rt(45)
def left():
    py.lt(45)
def increasize():
    global size
    while size>=1 and size<=20:
        py.pensize+=1
def decreasize():
    global size
    while size>=1 and size<=20:
        py.pensize-=1
wn.onkey(front,'w')
wn.onkey(back,'s')
wn.onkey(right,'d')
wn.onkey(left,'a')
wn.onkey(increasize,'Prior')
wn.onkey(decreasize,'Next')
wn.listen()
wn.mainloop()

但它给出了一个错误。完全追溯：

Exception in Tkinter callback
Traceback (most recent call last):
  File "c:\program files\python3\lib\tkinter\__init__.py", line 1549, in __call__
    return self.func(*args)
  File "c:\program files\python3\lib\turtle.py", line 686, in eventfun
    fun()
  File "D:\Python\draw_straight_key.py", line 19, in increasize
    py.pensize+=1
TypeError: unsupported operand type(s) for +=: 'method' and 'int'
Exception in Tkinter callback
Traceback (most recent call last):
  File "c:\program files\python3\lib\tkinter\__init__.py", line 1549, in __call__
    return self.func(*args)
  File "c:\program files\python3\lib\turtle.py", line 686, in eventfun
    fun()
  File "D:\Python\draw_straight_key.py", line 23, in decreasize
    py.pensize-=1
TypeError: unsupported operand type(s) for -=: 'method' and 'int'

Answer 1

看起来pensize（）是一个方法（不是变量），需要调用：https://docs.python.org/2/library/turtle.html#turtle.pensize

试试这个：

pensize = py.pensize()
pensize += 1
py.pensize(pensize)

Answer 2

您需要使用新大小调用pensize方法。

无法添加方法参考

例如，在increaseasize

中

size += 1
py.pensize(size)

此外，除非您希望大小始终为一个大小（20），然后将while循环更改为if语句

while size>=1 and size<=20:

TypeError：+ =的不支持的操作数类型：＆＃39;方法＆＃39;和＆＃39; int＆＃39;

2 个答案: