Python askdirectory（）将焦点更改为不同的窗口

我正在使用Tkinter构建两个窗口。一个是主窗口，按下按钮可创建第二个窗口

第二个窗口在创建时不会立即获得焦点。我可以通过调用.focus\u force（）来修复。但是，当我从tkFileDialog调用askdirectory（）函数时，焦点会变回第一个窗口

我如何防止焦点切换发生，而不只是到处调用focus_force（）

要复制问题，请执行以下操作：

from Tkinter import *
from tkFileDialog import *

class app:
    def __init__(self, master):
        Button(master, command = make_new).grid()
    def make_new(self):
        root = Tk()
        new = new_win(root)
        root.mainloop() #here the focus is on the first window
class new_win:
    def __init__(self, master):
        f = askdirectory() #even after placing focus on second window,
                           #focus goes back to first window here

---

我正在使用Python 2.7.3。谢谢

很少有文档记录的wm_属性方法可能有助于：

from Tkinter import *
import tkFileDialog

root = Tk()

top = Toplevel()
top.wm_attributes('-topmost', 1)
top.withdraw()
top.protocol('WM_DELETE_WINDOW', top.withdraw)

def do_dialog():
    oldFoc = top.focus_get()
    print tkFileDialog.askdirectory()    
    if oldFoc: oldFoc.focus_set()

b0 = Button(top, text='choose dir', command=do_dialog)
b0.pack(padx=100, pady=100)

def popup():
    top.deiconify()
    b0.focus_set()

b1 = Button(root, text='popup', command=popup)
b1.pack(padx=100, pady=100)
root.mainloop()