> My impression was that it was a bug in Python since the servlet's
> module *is* getting reloaded. Maybe if you can recreate the issue
> in a small standalone example, you can ask comp.lang.python for help.
Thanks for pointing me into the right direction.
I checked this and you're right. The problem is Python, or specifically
the linecache module used by traceback. The module is reloaded
correctly, but the old source is still in the linecache.
I have attached an example.
* A test_module with an erroneous line is loaded:
- the traceback is ok
* Then, a line is added to the test_module
and the module is reloaded:
- now the traceback displays the wrong line
* Finally, linecache.checkcache() is called
and the module is reloaded:
- now the traceback is ok again
I noticed that this problem exists only with Python 2.3. It seems to be
fixed in Python 2.4 already, so I think there is no need to discuss it
in comp.lang.python.
What I could do is add a linecache.checkcache() as a workaround.
There are four modules where this could be added - I'm unsere where is
the most appropriate place:
ServletFactory, ImportSpy, AutoReloadingAppServer or ExceptionHandler?
-- Christoph
import imp, linecache, traceback, time
def import_test():
print
fp, pathname, stuff = imp.find_module('test_module')
try:
module = imp.load_module('test_module', fp, pathname, stuff)
except:
traceback.print_exc()
fp.close()
script = '''print 'Loading test module...'
print 1/0
# no problem here
'''
file('test_module.py', 'w').write(script)
import_test()
time.sleep(2)
script = '''print 'Added line...'
''' + script
file('test_module.py', 'w').write(script)
import_test()
try:
linecache.checkcache('test_module.py')
except TypeError: # Python < 2.4 has not filename parameter
linecache.checkcache()
import_test()
