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From: Peter Otten <__peter__@web.de>
Subject: Re: importing and nose
Date: Thu, 19 Jan 2012 18:36:27 +0100
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19134

Andrea Crotti wrote:

> I'm writing some code to analyse pstats statistics, and I'm trying to
> have some working unit tests.
> Suppose I have in the test directory another directory 'profiling',
> which contains 'x.py', and 'b.py'.
> 
> Now running the following code in a script works perfectly,

I don't believe you.

> class TestStatParser(unittest.TestCase):
> 
>      def setUp(self):
>          self.temp_file = tempfile.mktemp()
>          prof_path = path.join(path.dirname(__file__), 'profiling')
>          sys.path.append(prof_path)
>          import x
>          profile.run('x.f1()', filename=self.temp_file)
> 
> 
> But running it within nose I get the following
> 
>      exec cmd in globals, locals
>    File "<string>", line 1, in <module>
> NameError: name 'x' is not defined
> 
> 
> Which doesn't make sense to me, because the import doesn't actually
> fails, so
> how can x not be defined???
> 
> Any clue?

profile.run() doesn't have access to the setUp() method's local namespace, 
it looks into the global (module) namespace. 
A stripped-down example:

>>> import profile
>>> def demo():
...     def foo(): print "local"
...     profile.run("foo()")
...
>>> demo()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 3, in demo
  File "/usr/lib/python2.6/profile.py", line 70, in run
    prof = prof.run(statement)
  File "/usr/lib/python2.6/profile.py", line 456, in run
    return self.runctx(cmd, dict, dict)
  File "/usr/lib/python2.6/profile.py", line 462, in runctx
    exec cmd in globals, locals
  File "<string>", line 1, in <module>
NameError: name 'foo' is not defined
>>> def foo():
...     print "global"
...
>>> demo()
global
         4 function calls in 0.000 CPU seconds
[snip]