Python Tkinter Checkbutton值始终等于0

问题描述

我将 checkbutton 放在 text 小部件上，但是每次我选择 checkbutton 时，函数 checkbutton_value 被调用，并返回0.

I put the checkbutton on the text widget, but everytime I select a checkbutton, the function checkbutton_value is called, and it returns 0.

部分代码是:

def callback():

    file_name=askopenfilename()
    column_1rowname,column_name=draw_column(file_name)

    root = Tk()
    root.resizable(width=False,height=False)
    root.wm_title("Column")


    S = Scrollbar(root,orient="vertical")
    text=Text(root,width=15,height=10,yscrollcommand=S.set)
    S.config(command=text.yview)
    S.pack(side="right",fill="y")
    text.pack(side="left",fill="both",expand=True)

    #check the value of the checkbutton
    def checkbutton_value():

        if(var.get()):

            print 1
        else:

            print 0

    var=BooleanVar()
    chk = Checkbutton(root, text=column_1rowname[1], variable=var, command=checkbutton_value)
    text.window_create("end", window=chk)
    text.config(state=DISABLED)


errmsg='Error!'
Button(text='File Open',command=callback).pack(fill=X)


mainloop()

推荐答案

问题是您有多个根窗口.您应该只创建一个 Tk 的实例，并只调用一次 mainloop .如果需要其他窗口，请创建顶级的实例.

The problem is that you have more than one root window. You should only ever create exactly one instance of Tk, and call mainloop exactly once. If you need additional windows, create instances of Toplevel.

每个根窗口(及其所有子窗口以及所有相关的 StringVar 等)都将启动一个新的独立 tcl解释器.与此窗口关联的窗口小部件和变量不能在另一个tcl解释器中使用.在您的情况下， StringVar 与第一个根窗口相关联，而小部件与第二个根窗口相关联.您不能在这样的根窗口之间共享数据.

Each root window (and all of its children, and all related StringVars etc.) start a new, independent tcl interpreter. Widgets and variables associated with this window can't be used in another tcl interpreter. In your case, the StringVar is associated with the first root window, but the widget is associated with the second. You can't share data between root windows like that.

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