Question

我的代码似乎运行正常，棕色方块出现在空白窗口中，直到我尝试按下其中一个键，当我这样做时，除了出现错误信息之外没有任何事情发生。有什么想法吗？

from tkinter import *

x, y, a, b = 50, 50, 100, 100
d = None

vel_dic = {
    "Left": ("left", -4, 0),
    "Right": ("right", 4, 0),
    "Down": ("down", 0, 4),
    "Up": ("up", 0, -4)}
class Sprite:
    def __init__(self):
        self.move
        self.x, self.y, self.a, self.b = 50, 50, 100, 100
        self.d = 0
        self.canvas = Canvas(tk, height = 600, width = 600)
        self.canvas.grid(row=0, column=0, sticky = W)
        self.coord = [self.x, self.y, self.a, self.b]
        self.shape = self.canvas.create_rectangle(*self.coord, outline = "#cc9900", fill = "#cc9900")
    def move():
        if self.direction != 0:
            self.canvas.move(self.rect, self.xv, self.yv)
        tk.after(33, move)
    def on_keypress(event):
        self.direction, self.xv, self.yv = vel_dic[event.keysym]
    def on_keyrelease(event):
        self.direction = 0 

tk = Tk()
tk.geometry("600x600")

sprite1 = Sprite()

tk.bind_all('<KeyPress>', sprite1.on_keypress)
tk.bind_all('<KeyRelease>', sprite1.on_keyrelease)

按右箭头键时出现错误消息：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\robsa\AppData\Local\Programs\Python\Python36-32\lib\idlelib\run.py", line 137, in main
    seq, request = rpc.request_queue.get(block=True, timeout=0.05)
  File "C:\Users\robsa\AppData\Local\Programs\Python\Python36-32\lib\queue.py", line 172, in get
    raise Empty
queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\robsa\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
TypeError: on_keypress() takes 1 positional argument but 2 were given
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\robsa\AppData\Local\Programs\Python\Python36-32\lib\idlelib\run.py", line 137, in main
    seq, request = rpc.request_queue.get(block=True, timeout=0.05)
  File "C:\Users\robsa\AppData\Local\Programs\Python\Python36-32\lib\queue.py", line 172, in get
    raise Empty
queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\robsa\AppData\Local\Programs\Python\Python36-32\lib\tkinter\__init__.py", line 1699, in __call__
    return self.func(*args)
TypeError: on_keyrelease() takes 1 positional argument but 2 were given

Answer 1

当调用对象内部的函数时，self（对象的实例）作为第一个参数发送。您可以使用某些方法撤消该操作，staticmethod是最常见的方法，但在这种情况下，这不是您要查找的内容。

您收到的错误表明解释器发送了此self参数和常规event参数，但您的方法只获取一个参数，并且无法处理它们。

除了其他参数外，请确保所有功能都self（或您选择的任何名称，如inst）作为第一个参数：

def on_keyrelease(self, event):

同样适用于move和on_keypress。

Python / Tkinter事件参数问题

1 个答案: