Re: reload fails if module not in sys.path
Lonnie Princehouse wrote: Maybe it could fall back to module.__file__ if the module isn't found in sys.path?? ... or reload could just take an optional path parameter... Or perhaps I'm the only one who thinks this is silly: my_module = imp.load_module(module_name, *imp.find_module(module_name,path)) reload(my_module) Traceback (most recent call last): File stdin, line 1, in ? ImportError: No module named whatever load_module doesn't do everything that import does. I guess I could just deal with this by fiddling with sys.path or using imp.load_module again, but.. um.. I like to complain. ;-) The context here is that I'm loading user-defined modules as plugins, and I don't want to keep the plugin directory in sys.path because of potential module name conflicts. so add the plugin-directory to the front of sys.path temporarily, and remove it after you've imported the plugins. (this also allows the plugin writers to split their plugins over multiple modules, something that can often be quite nice) /F -- http://mail.python.org/mailman/listinfo/python-list
Re: reload fails if module not in sys.path
It's not just load_module. Reload fails on modules imported normally if their paths are no longer in sys.path. Easy to reproduce example: bash$ mkdir module_dir bash$ touch module_dir/plugin.py bash$ python Python 2.4.1 (#1, Sep 25 2005, 15:12:45) [GCC 3.4.3 20041125 (Gentoo 3.4.3-r1, ssp-3.4.3-0, pie-8.7.7)] on linux2 Type help, copyright, credits or license for more information. import sys sys.path.append('module_dir') import plugin sys.path.pop() 'module_dir' reload(plugin)# plugin was imported correctly, but it can't be reloaded: Traceback (most recent call last): File stdin, line 1, in ? ImportError: No module named plugin sys.modules['plugin'] # ... although it is sys.modules: module 'plugin' from 'module_dir/plugin.py' -- http://mail.python.org/mailman/listinfo/python-list
Re: reload fails if module not in sys.path
That's OK, but you may find fiddling with sys.path is more productive :-) Yeah, that's what I'm doing and it works just fine. When I stumbled over this behavior yesterday it seemed (and still does) like a low-priority bug in reload. I was hoping a guru would reply with something like, Of course that's how it is. If reload() tried to use the __file__ attribute, a universe-ending paradox would ensue because... Feh. -- http://mail.python.org/mailman/listinfo/python-list
reload fails if module not in sys.path
So, it turns out that reload() fails if the module being reloaded isn't in sys.path. Maybe it could fall back to module.__file__ if the module isn't found in sys.path?? ... or reload could just take an optional path parameter... Or perhaps I'm the only one who thinks this is silly: my_module = imp.load_module(module_name, *imp.find_module(module_name,path)) reload(my_module) Traceback (most recent call last): File stdin, line 1, in ? ImportError: No module named whatever I guess I could just deal with this by fiddling with sys.path or using imp.load_module again, but.. um.. I like to complain. ;-) The context here is that I'm loading user-defined modules as plugins, and I don't want to keep the plugin directory in sys.path because of potential module name conflicts. -- http://mail.python.org/mailman/listinfo/python-list
Re: reload fails if module not in sys.path
Lonnie Princehouse wrote: So, it turns out that reload() fails if the module being reloaded isn't in sys.path. Maybe it could fall back to module.__file__ if the module isn't found in sys.path?? ... or reload could just take an optional path parameter... Or perhaps I'm the only one who thinks this is silly: my_module = imp.load_module(module_name, *imp.find_module(module_name,path)) reload(my_module) Traceback (most recent call last): File stdin, line 1, in ? ImportError: No module named whatever You appear to have failed to load some module called whatever, which I presume is the value of module_name? I guess I could just deal with this by fiddling with sys.path or using imp.load_module again, but.. um.. I like to complain. ;-) That's OK, but you may find fiddling with sys.path is more productive :-) The context here is that I'm loading user-defined modules as plugins, and I don't want to keep the plugin directory in sys.path because of potential module name conflicts. Hmm. I know that if your module isn't in sys.modules your reload will fail: import trPyCard # picking a moduule at random import sys del sys.modules['trPyCard'] reload(trPyCard) Traceback (most recent call last): File stdin, line 1, in ? ImportError: reload(): module trPyCard not in sys.modules Apart from that, it would seem sensible not to try and use reload if you haven't used a kosher import mechanism - there are many caveats on the reload() documentation, and the mechanisms it uses aren't spelled out anywhere but in the interpreter source. It would seem easier just to ensure that the plugins directory(ies) appear first on sys.path and use __import__(). imp is high magic. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC www.holdenweb.com PyCon TX 2006 www.python.org/pycon/ -- http://mail.python.org/mailman/listinfo/python-list