从按钮命令调用的函数与正常调用不同? (Python2 tkinter)

Function called from button command differs from normal call ? (Python2 tkinter)

这里我定义2 class:

from Tkinter import *

class Two:
    def __init__(self):
        self.main2 = Tk()
        self.mainFrame2 = Frame(self.main2)
        self.mainFrame2.pack()
        self.x= BooleanVar()
        self.cb = Checkbutton(self.mainFrame2,text='tick', variable = self.x)
        self.button2 = Button(self.mainFrame2,text ='button', command = self.Command)

        self.cb.pack()
        self.button2.pack()
        self.main2.mainloop()
    def Command(self):
        print self.x.get()
class One:
    def __init__(self):
        self.main = Tk()
        self.mainFrame = Frame(self.main)
        self.mainFrame.pack()
        self.button = Button(self.mainFrame,text ='Ok', command = lambda: self.callTwo())
        self.button.pack()
        self.main.mainloop()

    def callTwo(self):
        Two()

当我直接调用

Two()

勾选复选框,然后点击按钮,打印 1

但如果我打电话

One()

然后单击确定,勾选复选框,单击按钮,它会打印 0

这是为什么?我想调用 One() 并让它打印 1

您不能在 tkinter 应用程序中有两个 Tk 实例。如果要创建多个 window,请创建 Toplevel 的实例。您只能有一个 Tk 实例,并且应该只调用一次 mainloop