Question

我正在线上快速指南，开始在Python（2.7）中使用Tk，到目前为止，我有这段代码：

from Tkinter import *

root = Tk()
root.title("Note Taker")

root.mainloop()

button1 = Button(root, text="button1", command = Button1)
button2 = Button(root, text="button2", command = Button2)
button3 = Button(root, text="button3", command = Button3)


text = Entry(root)
listbox = Listbox(root)


text.pack()
button1.pack()
button2.pack()
button3.pack()
listbox.pack()


def Button1():
    listbox.insert(END, "button1 pressed")

def Button2():
    listbox.insert(END, "button2 pressed")

def Button3():
    text_contents = text.get()
    listbox.insert(END, text_contents)
    text.delete(0,END)

然而，当我运行它时，GUI被加载，但是没有显示任何按钮，而是我得到了这个＆＃39; NameError＆＃39;：

button1 = Button(root, text="button1", command = Button1)
NameError: name 'Button1' is not defined

我确定它纯粹是我的错误然而可以改变什么才能使其正常运行？

Answer 1

移动

def Button1():
    listbox.insert(END, "button1 pressed")

之前

button1 = Button(root, text="button1", command=Button1)

因为command = Button1引用Button1。

当然，对Button2和Button3执行相同操作。

同时移动

root.mainloop()

到脚本的底部，因此在定义Tkinter小部件之前，控制流不会被捕获到事件循环中。

from Tkinter import *

root = Tk()
root.title("Note Taker")


def Button1():
    listbox.insert(END, "button1 pressed")


def Button2():
    listbox.insert(END, "button2 pressed")


def Button3():
    text_contents = text.get()
    listbox.insert(END, text_contents)
    text.delete(0, END)


button1 = Button(root, text="button1", command=Button1)
button2 = Button(root, text="button2", command=Button2)
button3 = Button(root, text="button3", command=Button3)

text = Entry(root)
listbox = Listbox(root)

text.pack()
button1.pack()
button2.pack()
button3.pack()
listbox.pack()

root.mainloop()

Tkinter按钮未定义＆＃39;跑的时候

1 个答案: