[CLN] core: upgrade to python 3.6

& sort imports

closes odoo/documentation#2975

X-original-commit: 57784a2f90
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

extensions/github_link/__init__.py

@@ -19,9 +19,10 @@ Notes
 * explicitly imports ``odoo``, so useless for anyone else
 """
 
-import inspect
 import importlib
+import inspect
 import os.path
+
 import werkzeug
 
 
@@ -60,7 +61,7 @@ def setup(app):
         try:
             obj_source_path = inspect.getsourcefile(obj)
             _, line = inspect.getsourcelines(obj)
-        except (TypeError, IOError):
+        except (TypeError, OSError):
             # obj doesn't have a module, or something
             return None
 
@@ -115,4 +116,4 @@ def add_doc_link(app, pagename, templatename, context, doctree):
     source_suffix = app.config.source_suffix
     source_suffix = next(iter(source_suffix))
     context['github_link'] = lambda mode='edit': make_github_link(
-        app, 'content/%s%s' % (pagename, source_suffix), mode=mode)
+        app, f'content/{pagename}{source_suffix}', mode=mode)