Fix small numpydoc bug so docs build out of the box.

Already asked on numpy list if the fix is OK to upstream.

docs/sphinxext/numpydoc.py

@@ -1,116 +1,117 b''
 """
 ========
 numpydoc
 ========
 
 Sphinx extension that handles docstrings in the Numpy standard format. [1]
 
 It will:
 
 - Convert Parameters etc. sections to field lists.
 - Convert See Also section to a See also entry.
 - Renumber references.
 - Extract the signature from the docstring, if it can't be determined otherwise.
 
 .. [1] http://projects.scipy.org/scipy/numpy/wiki/CodingStyleGuidelines#docstring-standard
 
 """
 
 import os, re, pydoc
 from docscrape_sphinx import get_doc_object, SphinxDocString
 import inspect
 
 def mangle_docstrings(app, what, name, obj, options, lines,
                       reference_offset=[0]):
     if what == 'module':
         # Strip top title
         title_re = re.compile(r'^\s*[#*=]{4,}\n[a-z0-9 -]+\n[#*=]{4,}\s*',
                               re.I|re.S)
         lines[:] = title_re.sub('', "\n".join(lines)).split("\n")
     else:
         doc = get_doc_object(obj, what, "\n".join(lines))
         lines[:] = str(doc).split("\n")
 
     if app.config.numpydoc_edit_link and hasattr(obj, '__name__') and \
            obj.__name__:
         if hasattr(obj, '__module__'):
             v = dict(full_name="%s.%s" % (obj.__module__, obj.__name__))
         else:
             v = dict(full_name=obj.__name__)
         lines += ['', '.. htmlonly::', '']
         lines += ['    %s' % x for x in
                   (app.config.numpydoc_edit_link % v).split("\n")]
 
     # replace reference numbers so that there are no duplicates
     references = []
     for l in lines:
         l = l.strip()
         if l.startswith('.. ['):
             try:
                 references.append(int(l[len('.. ['):l.index(']')]))
             except ValueError:
                 print "WARNING: invalid reference in %s docstring" % name
 
     # Start renaming from the biggest number, otherwise we may
     # overwrite references.
     references.sort()
     if references:
         for i, line in enumerate(lines):
             for r in references:
                 new_r = reference_offset[0] + r
                 lines[i] = lines[i].replace('[%d]_' % r,
                                             '[%d]_' % new_r)
                 lines[i] = lines[i].replace('.. [%d]' % r,
                                             '.. [%d]' % new_r)
 
     reference_offset[0] += len(references)
 
 def mangle_signature(app, what, name, obj, options, sig, retann):
     # Do not try to inspect classes that don't define `__init__`
     if (inspect.isclass(obj) and
-        'initializes x; see ' in pydoc.getdoc(obj.__init__)):
+        (not hasattr(obj, '__init__') or
+        'initializes x; see ' in pydoc.getdoc(obj.__init__))):
         return '', ''
 
     if not (callable(obj) or hasattr(obj, '__argspec_is_invalid_')): return
     if not hasattr(obj, '__doc__'): return
 
     doc = SphinxDocString(pydoc.getdoc(obj))
     if doc['Signature']:
         sig = re.sub("^[^(]*", "", doc['Signature'])
         return sig, ''
 
 def initialize(app):
     try:
         app.connect('autodoc-process-signature', mangle_signature)
     except:
         monkeypatch_sphinx_ext_autodoc()
 
 def setup(app, get_doc_object_=get_doc_object):
     global get_doc_object
     get_doc_object = get_doc_object_
     
     app.connect('autodoc-process-docstring', mangle_docstrings)
     app.connect('builder-inited', initialize)
     app.add_config_value('numpydoc_edit_link', None, True)
 
 #------------------------------------------------------------------------------
 # Monkeypatch sphinx.ext.autodoc to accept argspecless autodocs (Sphinx < 0.5)
 #------------------------------------------------------------------------------
 
 def monkeypatch_sphinx_ext_autodoc():
     global _original_format_signature
     import sphinx.ext.autodoc
 
     if sphinx.ext.autodoc.format_signature is our_format_signature:
         return
 
     print "[numpydoc] Monkeypatching sphinx.ext.autodoc ..."
     _original_format_signature = sphinx.ext.autodoc.format_signature
     sphinx.ext.autodoc.format_signature = our_format_signature
 
 def our_format_signature(what, obj):
     r = mangle_signature(None, what, None, obj, None, None, None)
     if r is not None:
         return r[0]
     else:
         return _original_format_signature(what, obj)