tkinter窗口复选框操作

Question

My check box(admin_check) is not setting values in check_var while being toggled. When i remove root window it works fine but i can not remove since its necessary.

def c():
    print(check_var.get())


root=Tk()
#initially it must be minimised not to be open until login by user
root.quit() 
inst_window=Tk()


#instruction and login window

login_frame=Frame(inst_window,bg="lightpink",height=100,width=100)
check_var=StringVar()
admin_check=Checkbutton(login_frame,text="Adm",variable=check_var, onvalue='admin',offvalue='user',command=c)
login=Button(login_frame,text="login",command=c)
admin_check.grid(row=0,columnspan=2)
login.grid(row=1,columnspan=2)

login_frame.pack()
login_frame.pack_propagate(0)

root.mainloop()

Answer 1

As Brian Oakley mentioned, you cannot have two Tk() , Instead use Toplevel()

Change inst_window=Tk()

To inst_window=Toplevel(root)

Once you've done that, there are no other problems and the code works fine. You may also want to set the default of your checkbox to unselected, you can do this:

check_var.set("user")