为什么我会得到一个空白的tkinter窗口？

Question

所以，当我运行这段代码，然后单击按钮：

from Tkinter import * 
import thread 
class App: 
    def __init__(self, master): 
     print master 

     def creatnew(): 

      admin=Tk() 
      lab=Label(admin,text='Workes') 
      lab.pack() 
      admin.minsize(width=250, height=250) 
      admin.maxsize(width=250, height=250) 
      admin.configure(bg='light green') 
      admin.mainloop() 
     def other(): 
      la=Label(master,text='other') 
      la.pack() 
      bu=Button(master,text='clicks',command=lambda: thread.start_new_thread(creatnew,())) 
      bu.pack() 
     other() 

Admin = Tk() 

Admin.minsize(width=650, height=500) 
Admin.maxsize(width=650, height=500) 
app = App(Admin) 
Admin.mainloop() 

我获得第二次的Tkinter窗口，但它是一个白色的空白屏幕，使这两个程序没有响应。 任何想法

Answer 1

不要使用线程。令人困惑的是Tkinter主循环。对于第二个窗口创建一个Toplevel窗口。

您以最小的改动代码：

from Tkinter import * 
# import thread # not needed 

class App: 
    def __init__(self, master): 
     print master 

     def creatnew(): # recommend making this an instance method 

      admin=Toplevel() # changed Tk to Toplevel 
      lab=Label(admin,text='Workes') 
      lab.pack() 
      admin.minsize(width=250, height=250) 
      admin.maxsize(width=250, height=250) 
      admin.configure(bg='light green') 
      # admin.mainloop() # only call mainloop once for the entire app! 
     def other(): # you don't need define this as a function 
      la=Label(master,text='other') 
      la.pack() 
      bu=Button(master,text='clicks',command=creatnew) # removed lambda+thread 
      bu.pack() 
     other() # won't need this if code is not placed in function 

Admin = Tk() 

Admin.minsize(width=650, height=500) 
Admin.maxsize(width=650, height=500) 
app = App(Admin) 
Admin.mainloop()