Threads and import

rsoh.woodhouse at googlemail.com rsoh.woodhouse at googlemail.com
Wed May 28 17:38:42 EDT 2008 

On May 28, 10:24 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> rsoh.woodho... at googlemail.com schrieb:
>
>
>
> > On May 28, 8:52 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> >> rsoh.woodho... at googlemail.com schrieb:
>
> >>> On May 28, 8:26 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> >>>> rsoh.woodho... at googlemail.com schrieb:
> >>>>> Hi,
> >>>>> I'm trying to work out some strange (to me) behaviour that I see when
> >>>>> running a python script in two different ways (I've inherited some
> >>>>> code that needs to be maintained and integrated with another lump of
> >>>>> code). The sample script is:
> >>>>> # Sample script, simply create a new thread and run a
> >>>>> # regular expression match in it.
> >>>>> import re
> >>>>> import threading
> >>>>> class TestThread(threading.Thread):
> >>>>>     def run(self):
> >>>>>         print('start')
> >>>>>         try:
> >>>>>             re.search('mmm', 'mmmm')
> >>>>>         except Exception, e:
> >>>>>             print e
> >>>>>         print('finish')
> >>>>> tmpThread = TestThread()
> >>>>> tmpThread.start()
> >>>>> tmpThread.join()
> >>>>> import time
> >>>>> for i in range(10):
> >>>>>     time.sleep(0.5)
> >>>>>     print i
> >>>>> # end of sample script
> >>>>> Now if I run this using:
> >>>>> $ python ThreadTest.py
> >>>>> then it behaves as expected, ie an output like:
> >>>>> start
> >>>>> finish
> >>>>> 0
> >>>>> 1
> >>>>> 2
> >>>>> ...
> >>>>> But if I run it as follows (how the inherited code was started):
> >>>>> $ python -c "import TestThread"
> >>>>> then I just get:
> >>>>> start
> >>>>> I know how to get around the problem but could someone with more
> >>>>> knowledge of how python works explain why this is the case?
> >>>> Works for me. And I don't see any reason why it shouldn't for you -
> >>>> unless you didn't show us the actual code.
> >>>> Diez
> >>> Strange. That is the code exactly as I run it using python 2.4.4 2.5.1
> >>> on Ubuntu 7.10. Which version of python/what platform were you using?
> >> mac-dir:/tmp deets$ python
> >> Python 2.5.1 (r251:54869, Apr 18 2007, 22:08:04)
> >> [GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
> >> Type "help", "copyright", "credits" or "license" for more information.
> >> Welcome to rlcompleter2 0.96
> >> for nice experiences hit <tab> multiple times
>
> >> But I doubt this changes anything.
>
> >> Diez
>
> > Hmm. Just tested it again on OS X Python 2.4.4 and custom build of
> > Python 2.4.5 on Debian and get the same results as I had before.
>
> Are you sure that ThreadTest isn't a somewhere else installed module?
> youc can use python -v to check where python gets it's files.
>
> and how about you attach/paste the full script somewhere?
>
> Diez

This is the full script straight from the text editor:

# START

import re

import threading
class TestThread(threading.Thread):

    def run(self):
        print('start')
        try:
            re.search('mmm', 'mmmm')
        except Exception, e:
            print e
        print('finish')

tmpThread = TestThread()
tmpThread.start()
tmpThread.join()
import time
for i in range(10):
    time.sleep(0.5)
    print i

# END

In OS X I get the following output (where TestThread.py is in the
current directory):

$ python -v -c "import TestThread"
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
site.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/site.py
import site # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/site.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
os.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/os.py
import os # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/os.pyc
import posix # builtin
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
posixpath.pyc matches /Library/Frameworks/Python.framework/Versions/
2.4/lib/python2.4/posixpath.py
import posixpath # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/posixpath.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
stat.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/stat.py
import stat # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/stat.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
UserDict.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/
lib/python2.4/UserDict.py
import UserDict # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/UserDict.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
copy_reg.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/
lib/python2.4/copy_reg.py
import copy_reg # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/copy_reg.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
types.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/
lib/python2.4/types.py
import types # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/types.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
warnings.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/
lib/python2.4/warnings.py
import warnings # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/warnings.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
linecache.pyc matches /Library/Frameworks/Python.framework/Versions/
2.4/lib/python2.4/linecache.py
import linecache # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/linecache.pyc
import encodings # directory /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/encodings
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
encodings/__init__.pyc matches /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/encodings/__init__.py
import encodings # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/encodings/__init__.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
codecs.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/
lib/python2.4/codecs.py
import codecs # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/codecs.pyc
import _codecs # builtin
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
encodings/aliases.pyc matches /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/encodings/aliases.py
import encodings.aliases # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/encodings/aliases.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
encodings/ascii.pyc matches /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/encodings/ascii.py
import encodings.ascii # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/encodings/ascii.pyc
Python 2.4.4 (#1, Oct 18 2006, 10:34:39)
[GCC 4.0.1 (Apple Computer, Inc. build 5341)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
import TestThread # from TestThread.py
# wrote TestThread.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
re.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/re.py
import re # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/re.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
sre.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/lib/
python2.4/sre.py
import sre # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/sre.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
sre_compile.pyc matches /Library/Frameworks/Python.framework/Versions/
2.4/lib/python2.4/sre_compile.py
import sre_compile # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/sre_compile.pyc
import _sre # builtin
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
sre_constants.pyc matches /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/sre_constants.py
import sre_constants # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/sre_constants.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
sre_parse.pyc matches /Library/Frameworks/Python.framework/Versions/
2.4/lib/python2.4/sre_parse.py
import sre_parse # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/sre_parse.pyc
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
threading.pyc matches /Library/Frameworks/Python.framework/Versions/
2.4/lib/python2.4/threading.py
import threading # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/threading.pyc
import thread # builtin
import time # dynamically loaded from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/lib-dynload/time.so
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
traceback.pyc matches /Library/Frameworks/Python.framework/Versions/
2.4/lib/python2.4/traceback.py
import traceback # precompiled from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/traceback.pyc
import collections # dynamically loaded from /Library/Frameworks/
Python.framework/Versions/2.4/lib/python2.4/lib-dynload/collections.so
# /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/
atexit.pyc matches /Library/Frameworks/Python.framework/Versions/2.4/
lib/python2.4/atexit.py
import atexit # precompiled from /Library/Frameworks/Python.framework/
Versions/2.4/lib/python2.4/atexit.pyc
start


At which point it just hangs.

Thanks,
Rowan

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