在Tkinter中打开新窗口将冻结程序（python 3.6）

Question

I have something like this:

first.py

from tkinter import *

def new_window(event):
    root.destroy()
    import second

root = Tk()
b = Button(root, text='New window')
b.pack()
b.bind('<Button-1>', new_window)
root.mainloop()

second.py

from tkinter import *
root = Tk()
root.mainloop()

But when I open the second window, the first one is destroyed (I hope so), but the second one is frozen (it is shown, but there is no close-button on the top and I only see the launch-icon). Why is it so? Don't I kill the first loop?

Answer 1

The problem is likely because import second never returns since the last thing it does is call root.mainloop() . Since it never returns, the callback in the first window never finishes. And since it never finishes, it's not able to process any other events.