Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Programming > Python > Re: A thread import problem

Thread Tools

Re: A thread import problem

Bruce Sherwood
Posts: n/a
I couldn't get a simple test case to work. I append a listing of the
little test files, all in the same folder. The diagnostic statement
print('after start_new_thread\n') works, but then nothing. Originally
I tried importing but was worried that the circular
importing (A imports B which imports A) would be a problem, hence the
test of importing a version of the test program without the import.

The failure of this test case suggests that one cannot do imports
inside secondary threads started in imported modules, something I keep
tripping over. But I hope you'll be able to tell me that I'm doing
something wrong!

Incidentally, a simple test is to execute the file, in which
case everything works.

Bruce Sherwood

--------------------------- -- execute this file

from ABA import *
print('exec testABA')
from math import sin

---------------------------- -- a version of without the import of ABA

print('exec testABA_noimport')
from math import sin


from thread import start_new_thread
from time import sleep
import sys

user = 'testABA_noimport'
start_new_thread(lambda: __import__(user), ())
print('after start_new_thread\n')

while True:

On Sat, Jul 21, 2012 at 2:32 AM, Dieter Maurer <(E-Mail Removed)> wrote:
> The usual approach to this situation is to invoke the user code via
> a callback from the UI main loop or invoke it explicitely
> after the UI system has been set up immediately before its main loop
> is called. Might look somehow like this:
> main thread:
> from thread import start_new_thread
> from visual import setup_gui, start_main_loop
> setup_gui() # sets up the GUI subsystem
> start_new_thread(lambda: __import__(<your module>), ())
> start_main_loop()

Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Re: A thread import problem Dieter Maurer Python 0 07-19-2012 08:31 AM
Re: A thread import problem Dennis Lee Bieber Python 0 07-19-2012 12:47 AM
A thread import problem Bruce Sherwood Python 0 07-18-2012 11:03 PM
problem(s) with import from parent dir: "from ../ import sir_robin" per9000 Python 7 02-27-2006 06:36 PM
Problem with import "from omniORB import CORBA, PortableServer" Stefan Seefeld Python 3 04-11-2005 08:54 PM