On 10/4/07, mhearne808[insert-at-sign-here]gmail[insert-dot-here]com <[EMAIL PROTECTED]> wrote: > I think I don't understand how the module search path works... > > Let's say I have a folders called 'test'. Underneath it, I create two > more folders called 'foo' and 'bar'. > > In 'foo', I create an empty '__init__.py' file, indicating that this > folder is a package 'foo'. I then create a simple python script > 'foo.py' consisting of the following code: > > ---------------------------- > #!/usr/bin/python > > def printhello(): > print 'Hello world!' > ---------------------------- > > Then in test/bar, I create 'bar.py' consisting of the following code: > ---------------------------- > #!/usr/bin/python > import sys > import os > (curpath,thisdir) = os.path.split(os.getcwd()) > foopath = os.path.join(curpath,'foo') > sys.path.append(foopath) > print sys.path > os.chdir(os.path.join(os.getcwd(),'..')) > print os.getcwd() > from foo.foo import printhello > ---------------------------- > > When I try to run bar.py, I get the following: > > ---------------------------- > [sys.path search path, including full path to 'foo' folder] > path/to/test > Traceback (most recent call last): > File "/path/to/test/bar/testfoo.py", line 16, in <module> > from foo.foo import printhello > ImportError: No module named foo > ---------------------------- > > Why? If 'foo' is in sys.path, shouldn't it appear when I try to > import the foo module from it?
No. foo will be searched for modules, but foo itself won't be found (because it's looking *inside* foo). You want "test" to be on sys.path for this to work. >Incidentally, when I move the script > up to 'test' and modify it so that it just says: > ---------------------------- > #!/usr/bin/python > > from foo.foo import printhello > ---------------------------- > > I get no errors. I don't understand the difference... > The directory that the executing script is in is implicitly on sys.path, so when you do this you place "test" in sys.path, and foo is found. -- http://mail.python.org/mailman/listinfo/python-list
