How can i create a Modal Dialogue Box by messagebox.showerror - python-3.x

Question

How can I create a Modal Dialogue Box by messagebox.showerror?
messagebox.showerror("Error", "No downloader.exe found")
When I create a messagebox, I found I can move the root windows.
and i need to create a Modal Dialogue Box like filedialog.askopenfilename.
filedialog.askopenfilename(initialdir = self.get_path()+ '/bin', filetypes=[("BIN Files", ".bin")])
here's the codes:
import tkinter
from tkinter import *
from tkinter import ttk
from tkinter import messagebox
import os
class Application(Frame):
def createWidgets(self, main_frame):
#self.llabel = Label(main_frame, text="Ready", width=20, bg="turquoise", font = ftLabel)
#self.llabel.grid(row=0, column=0, sticky=W+E) #columnspan=2
self.frame1 = Frame(main_frame)
self.frame1.grid(row=0, column=0, columnspan=2, sticky=W+E+N+S)
self.addr = StringVar()
self.addrtext = Entry(self.frame1, width=20, textvariable = self.addr)
self.addrtext.grid(row=0, column=0, sticky=W+E+N+S)
self.addr.set("0x0")
self.bfile = Button(self.frame1, text='BIN File', width=20)
self.bfile.grid(row=0, column=1, sticky=W+E+N+S)
messagebox.showerror("Error", "No downloader.exe found")
def __init__(self, master=None):
Frame.__init__(self, master)
self.pack(fill=BOTH, expand=1)
main_frame = Frame(master)
main_frame.pack(fill="y", expand=1)
self.createWidgets(main_frame)
self.dl_thread = 0
if __name__=="__main__":
root = Tk()
#lock the root size
root.resizable(False,False)
app = Application(master=root)
app.mainloop()

Answer 1

I tried your code and messagebox.showerror is modal to me.
Maybe there is something else in your code (threads?) or maybe it's
dependent on your environment.
For reference, my entire code:
from tkinter import *
from tkinter import messagebox
root = Tk()
def do(): messagebox.showerror("Error", "No downloader.exe found")
b = Button(root, text='Dialog', command=do)
b.pack()
root.mainloop()
If that doesn't work you might want to take a look at: Tkinter messagebox not behaving like a modal dialog