[TIP] How do I get nose to add the cwd to sys.path?

[Daryl Spitzer]

On Fri, Nov 14, 2008 at 3:42 PM, Kumar McMillan
<kumar.mcmillan at gmail.com> wrote:

> Here's what happened.  Nose saw that you were running tests from a
> directory containing __init__.py so it assumed you want to treat that
> directory as a module.  Therefore, if you change your code to
>
> from foo import bar
>
> that will work without any modification to sys.path.

Yep, that worked in my test.  It didn't work in my "real" code, and
then I realized that "foo" was itself in a package, and so on.  (I'm
adding unit tests to some legacy code.)  So I had to use something
like:

from kilroy.was.here.foo import bar

> However, using absolute paths is better practice since relative
> imports are deprecated in 2.6 (you get a warning).

I understand that better now after reading
http://www.python.org/dev/peps/pep-0328/ over a couple times.

> For extra entertainment, you can re-run your tests with
> --debug=nose.importer and take note of the insert ... into sys.path
> log statements.

That's quite useful.  Did I miss seeing that in the nose documentation
somewhere, or is that an undocumented feature?

>>> btw, you could also try the nose users list.
>>
>> Where do I find that?
>
> sorry, a URL would help :)
> http://groups.google.com/group/nose-users?pli=1

Thanks.  I joined up.

> I'd suggest bringing this up.  I'm curious what Jason's explanation is.

I don't need to, since Jason replied to this thread.

Thanks for your help Kumar.

--
Daryl


On Fri, Nov 14, 2008 at 3:42 PM, Kumar McMillan
<kumar.mcmillan at gmail.com> wrote:
> On Thu, Nov 13, 2008 at 4:27 PM, Daryl Spitzer <daryl.spitzer at gmail.com> wrote:
>> Here's what the directory structure looks like:
>>
>> foo/__init__.py [empty]
>> foo/bar.py
>> foo/tests/__init__.py [empty]
>> foo/tests/bar_tests.py [contains "import bar"]
>>
>> I'm running `nosetests` from the foo directory.
>> ...
>
> huh, right you are.  it does not let you import bar even though your
> working directory should allow you to.
>
> Here's what happened.  Nose saw that you were running tests from a
> directory containing __init__.py so it assumed you want to treat that
> directory as a module.  Therefore, if you change your code to
>
> from foo import bar
>
> that will work without any modification to sys.path.
>
> I'm not sure exactly why nose does this.  Jason Pellerin wrote that
> code so he probably knows.  However, using absolute paths is better
> practice since relative imports are deprecated in 2.6 (you get a
> warning).  For extra entertainment, you can re-run your tests with
> --debug=nose.importer and take note of the insert ... into sys.path
> log statements.  See below for a spoiler!
>
>>
>>> btw, you could also try the nose users list.
>>
>> Where do I find that?
>
> sorry, a URL would help :)
> http://groups.google.com/group/nose-users?pli=1
>
> I'd suggest bringing this up.  I'm curious what Jason's explanation is.
>
>
> spoiler:
>
> $ nosetests --debug=nose.importer
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl/foo
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: insert /Users/kumar/tmp/nose_daryl into sys.path
> nose.importer: DEBUG: Import foo from /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: find module part foo (foo) in
> ['/Users/kumar/tmp/nose_daryl']
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl/foo
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: Import foo.tests from /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: find module part foo (foo) in
> ['/Users/kumar/tmp/nose_daryl']
> nose.importer: DEBUG: sys.modules has foo as <module 'foo' from
> '/Users/kumar/tmp/nose_daryl/foo/__init__.pyc'>
> nose.importer: DEBUG: module already loaded? mod:
> /Users/kumar/tmp/nose_daryl new: /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: find module part tests (foo.tests) in
> ['/Users/kumar/tmp/nose_daryl/foo']
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl/foo/tests
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl/foo
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: Import foo.tests.bar_tests from
> /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: Add path /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: find module part foo (foo) in
> ['/Users/kumar/tmp/nose_daryl']
> nose.importer: DEBUG: sys.modules has foo as <module 'foo' from
> '/Users/kumar/tmp/nose_daryl/foo/__init__.pyc'>
> nose.importer: DEBUG: module already loaded? mod:
> /Users/kumar/tmp/nose_daryl new: /Users/kumar/tmp/nose_daryl
> nose.importer: DEBUG: find module part tests (foo.tests) in
> ['/Users/kumar/tmp/nose_daryl/foo']
> nose.importer: DEBUG: sys.modules has foo.tests as <module 'foo.tests'
> from '/Users/kumar/tmp/nose_daryl/foo/tests/__init__.pyc'>
> nose.importer: DEBUG: module already loaded? mod:
> /Users/kumar/tmp/nose_daryl/foo new: /Users/kumar/tmp/nose_daryl/foo
> nose.importer: DEBUG: find module part bar_tests (foo.tests.bar_tests)
> in ['/Users/kumar/tmp/nose_daryl/foo/tests']
> E
> ======================================================================
> ERROR: Failure: ImportError (No module named bar)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/nose-0.10.2-py2.4.egg/nose/loader.py",
> line 363, in loadTestsFromName
>    module = self.importer.importFromPath(
>  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/nose-0.10.2-py2.4.egg/nose/importer.py",
> line 39, in importFromPath
>    return self.importFromDir(dir_path, fqname)
>  File "/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packages/nose-0.10.2-py2.4.egg/nose/importer.py",
> line 84, in importFromDir
>    mod = load_module(part_fqname, fh, filename, desc)
>  File "/Users/kumar/tmp/nose_daryl/foo/tests/bar_tests.py", line 2, in ?
>    import bar
> ImportError: No module named bar
>
> ----------------------------------------------------------------------
> Ran 1 test in 0.001s
>
> FAILED (errors=1)
>