Importing separate files/modules into 'main.py' file & error messages while closing main app.

[AaronCatolico]

I'd like to have my "main.py" import separate files/modules such as "control1.py" in order to stay organized (obviously) and keep my "main.py" file simple, but I'm not sure if I'm structuring my files correctly.

Here's what my "main.py" looks like:

from flet import *
from control1 import *

def main(page:flet.Page):
    page.title = 'Main'
    page.window_width = 500
    page.window_height= 500
    page.bgcolor='#333333'
    page.window_center()
    page.theme_mode='light'

    #I would like to add controls to the page from
    # separate files/modules like below if possible
    page.add(count_text, start_btn)

flet.app(target=main, assets_dir='assets')

.....and here is what my "control1.py" file looks like:

from flet import *
import time

def count_up(e):
    for i in range(1, 1001):
        count_text.value = f'Count #{i}'
        count_text.update()
        time.sleep(0.005)


count_text = Text('Count # 0', size=15, weight='bold', color='white')
start_btn = TextButton(content=Text('START', size=15, color='white', weight='bold'), style=ButtonStyle(bgcolor='green'),
                       on_click=count_up)

Also, after clicking the 'START' button on this simple count up app and then trying to close the form to exit the program while it's still counting up on the thread, I keep getting this error:

Exception in thread Thread-1 (__connection_loop):
Traceback (most recent call last):
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet\sync_local_socket_connection.py", line 143, in __connection_loop
    message = self.__recv_msg(self.__connection)
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet\sync_local_socket_connection.py", line 164, in __recv_msg
    raw_msglen = self.__recvall(sock, 4)
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet\sync_local_socket_connection.py", line 176, in __recvall
    packet = sock.recv(n - len(data))
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host
Exception in thread Thread-7 (count_up):
Traceback (most recent call last):
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\threading.py", line 1016, in _bootstrap_inner
    self.run()
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\threading.py", line 953, in run
    self._target(*self._args, **self._kwargs)
  File "C:\Users\Aaron\Documents\Python\EBSEO PRO\testing\testing\control1.py", line 7, in count_up
    count_text.update()
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet_core\control.py", line 261, in update
    self.__page.update(self)
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet_core\page.py", line 258, in update
    r = self.__update(*controls)
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet_core\page.py", line 362, in __update
    results = self.__conn.send_commands(self._session_id, commands).results
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet\sync_local_socket_connection.py", line 121, in send_commands
    self.__send(ClientMessage(ClientActions.PAGE_CONTROLS_BATCH, messages))
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet\sync_local_socket_connection.py", line 154, in __send
    self.__send_msg(self.__connection, j.encode("utf-8"))
  File "C:\Users\Aaron\AppData\Local\Programs\Python\Python310\lib\site-packages\flet\sync_local_socket_connection.py", line 159, in __send_msg
    sock.sendall(msg)
OSError: [WinError 10038] An operation was attempted on something that is not a socket

Process finished with exit code 0

I don't know if this is because I didn't structure my files correctly ('main.py' and 'control1.py') or if this is some kind of bug that needs to be reported to the Flet developers. If I'm wrong on the structure of the files, please explain. Thanks.

[FeodorFitsner]

Hi Aaron,

I believe that issue was fixed yesterday and you can give fix a try by installing pre-release version of Flet:

pip install flet --upgrade --pre

Let me know how that worked.

[FeodorFitsner]

Try with a simple "hello, world" Flet program in one file? Also, how do you run the program?

[AaronCatolico]

Yes, I've had plenty of experience with using only one file for testing and running a for loop at very fast speeds without any problems. It's only when I try to separate the files and import the modules into the 'main.py' file that this is happening. It only happens in the fast speeds of time.sleep(0.02) or below while updating the UI from separate files, then try closing the app during it's process - these errors are then thrown.

[AaronCatolico]

Oh, and also, to answer your other question, I run the two separate files in Pycharm 'Python Interpreter'.

[FeodorFitsner]

OK, if it works on a simple program then I'd remove import * first. Use import flet as ft and then prefix controls with ft., e.g. ft.Page.
from control1 import * looks iffy too.

[AaronCatolico]

Here's the changes I've made to these two files, but still, it keeps throwing the error when trying to end/close the window:

'main.py'

import flet as ft
from control1 import count_text, start_btn

def main(page: ft.Page):
    page.title = 'Main'
    page.window_width = 500
    page.window_height= 500
    page.bgcolor='#333333'
    page.window_center()
    page.theme_mode='light'

    count_text.value = 'YOOOOOO!'

    con1 = ft.Container(width=300, height=100, bgcolor='blue', border=ft.border.all(3, 'white'), border_radius=6)

    page.add(ft.Row([count_text, start_btn]))

ft.app(target=main, assets_dir='assets')

'control1.py'

import flet as ft
import time

def count_up(e):
    for i in range(1, 1001):
        count_text.value = f'Count #{i}'
        count_text.update()
        time.sleep(.005)


count_text = ft.Text('Count # 0', size=15, weight='bold', color='white')
start_btn = ft.TextButton(content=ft.Text('START', size=15, color='white', weight='bold'), style=ft.ButtonStyle(bgcolor='green'),
                       on_click=count_up)

ERROR MESSAGE:
ConnectionResetError: [WinError 10054] An existing connection was forcibly closed by the remote host

[FeodorFitsner]

what version of Flet is that? Could you please run flet --version?

[AaronCatolico]

The version that I'm currently running is: 0.5.0.dev1189

[FeodorFitsner]

A fix has been committed to main. You can try the fix with pip install flet --upgrade --pre.
Let me know how that worked.

[AaronCatolico]

Sorry for the delay in response time. I've been super busy with a project. Anyhow, this seems to have fixed the problem. Thank you for your help, Feodor and thank you for building such an awesome framework that will continue to grow and become the best GUI framework for Python!

[FeodorFitsner]

Thanks for the update!