在使用sphinx进行构建时，我无法弄清楚如何检查何时引发异常。我有以下代码行：
sphinx.build_main(['-b html', source_dir, target_dir])
如果构建的某些部分不正确，函数build_main main会抛出错误，但是内部的捕获和处理异常意味着我无法明确尝试抓住他们。例如，函数build_main的输出是
Running Sphinx v1.3.1
loading translations [Python]... not available for built-in messages
loading pickled environment... done
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 0 source files that are out of date
updating environment: 0 added, 1 changed, 0 removed
reading sources... [100%] test
C:\Users\fakeuser\Documents\Github\travis-sphinx\test\docs\source\test.rst:7: WARNING: autodoc: failed to import module u'test.t
his'; the following exception was raised:
Traceback (most recent call last):
File "c:\users\grant mercer\anaconda\lib\site-packages\sphinx-1.3.1-py2.7.egg\sphinx\ext\autodoc.py", line 385, in import_object
__import__(self.modname)
ImportError: No module named this
looking for now-outdated files... none found
pickling environment... done
checking consistency... done
preparing documents... done
writing output... [100%] test
generating indices... genindex
writing additional pages... search
copying static files... done
copying extra files... done
dumping search index in English (code: en) ... done
dumping object inventory... done
build succeeded, 1 warning.
我故意创建此错误的目的是捕获这样的东西，但我无法弄清楚如何。无论如何都要检测内部函数中何时抛出异常，即使它在我可以使用它之前被捕获并处理了？我试过了
try:
sphinx.build_main(['-b html', source_dir, target_dir])
except:
print 'exception!'
但没有抓到（正如预期的那样）