python won't create thread?

Question

I might be missing something silly, but ive ran my code in pythonwin and it works, but when I run it in command-line it freaks

import time, thread
def print_t(name, delay):
    while 1:
        time.sleep(delay)
        print name
try:
    thread.start_new_thread(print_t,("First Message",1,))
    thread.start_new_thread(print_t,("Second Message",2,))
except Exception as e:
    print e

Unhandled exception in thread started by
sys.excepthook is missing
lost sys.stderr

Unhandled exception in thread started by
sys.excepthook is missing
lost sys.stderr

One thing you might like to know is that import pdb;pdb.pm() will open the debugger at the point of the last exception. — Marcin
– Marcin, Commented Feb 2, 2012 at 15:25

Community · Accepted Answer · 2017-05-23 12:27:29Z

6

The exception happens when the main thread (the one that starts other threads) finishes. In your code the main thread quits before any of your sub threads (created by start_new_thread) finish. The solution is to wait at your main thread till the child threads ends.

See the discussion Simple threading in Python 2.6 using thread.start_new_thread()

edited May 23, 2017 at 12:27

CommunityBot

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answered Feb 2, 2012 at 15:29

Mariusz Jamro

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Comments

glglgl · Accepted Answer · 2012-02-02 15:30:57Z

2

It is because the main thread ends, and as you use thread insted of threading, the "child threads" die as well.

Better use the module threading.

answered Feb 2, 2012 at 15:30

glglgl

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