diff --git a/_pytest/_argcomplete.py b/_pytest/_argcomplete.py
index 955855a96..3ab679d8b 100644
--- a/_pytest/_argcomplete.py
+++ b/_pytest/_argcomplete.py
@@ -87,6 +87,7 @@ class FastFilesCompleter:
             completion.append(x[prefix_dir:])
         return completion
 
+
 if os.environ.get('_ARGCOMPLETE'):
     try:
         import argcomplete.completers
diff --git a/_pytest/_code/code.py b/_pytest/_code/code.py
index 5b4237939..616d5c431 100644
--- a/_pytest/_code/code.py
+++ b/_pytest/_code/code.py
@@ -343,6 +343,7 @@ class Traceback(list):
             l.append(entry.frame.f_locals)
         return None
 
+
 co_equal = compile('__recursioncache_locals_1 == __recursioncache_locals_2',
                    '?', 'eval')
 
@@ -846,6 +847,7 @@ def getrawcode(obj, trycall=True):
                     return x
         return obj
 
+
 if sys.version_info[:2] >= (3, 5):  # RecursionError introduced in 3.5
     def is_recursion_error(excinfo):
         return excinfo.errisinstance(RecursionError)  # noqa
diff --git a/_pytest/_code/source.py b/_pytest/_code/source.py
index 846e3cced..522150b55 100644
--- a/_pytest/_code/source.py
+++ b/_pytest/_code/source.py
@@ -265,6 +265,7 @@ def findsource(obj):
     source.lines = [line.rstrip() for line in sourcelines]
     return source, lineno
 
+
 def getsource(obj, **kwargs):
     import _pytest._code
     obj = _pytest._code.getrawcode(obj)
@@ -275,6 +276,7 @@ def getsource(obj, **kwargs):
     assert isinstance(strsrc, str)
     return Source(strsrc, **kwargs)
 
+
 def deindent(lines, offset=None):
     if offset is None:
         for line in lines:
@@ -288,6 +290,7 @@ def deindent(lines, offset=None):
     if offset == 0:
         return list(lines)
     newlines = []
+
     def readline_generator(lines):
         for line in lines:
             yield line + '\n'
diff --git a/_pytest/assertion/__init__.py b/_pytest/assertion/__init__.py
index fd1ebe2c1..18cb7d32c 100644
--- a/_pytest/assertion/__init__.py
+++ b/_pytest/assertion/__init__.py
@@ -80,10 +80,12 @@ def install_importhook(config):
     config._assertstate.hook = hook = rewrite.AssertionRewritingHook(config)
     sys.meta_path.insert(0, hook)
     config._assertstate.trace('installed rewrite import hook')
+
     def undo():
         hook = config._assertstate.hook
         if hook is not None and hook in sys.meta_path:
             sys.meta_path.remove(hook)
+
     config.add_cleanup(undo)
     return hook
 
diff --git a/_pytest/assertion/rewrite.py b/_pytest/assertion/rewrite.py
index 6b4c1f483..c2098936d 100644
--- a/_pytest/assertion/rewrite.py
+++ b/_pytest/assertion/rewrite.py
@@ -276,6 +276,7 @@ def _write_pyc(state, co, source_stat, pyc):
         fp.close()
     return True
 
+
 RN = "\r\n".encode("utf-8")
 N = "\n".encode("utf-8")
 
diff --git a/_pytest/capture.py b/_pytest/capture.py
index 9f60db6ac..eea81ca18 100644
--- a/_pytest/capture.py
+++ b/_pytest/capture.py
@@ -152,6 +152,7 @@ class CaptureManager:
         item.add_report_section(when, "stdout", out)
         item.add_report_section(when, "stderr", err)
 
+
 error_capsysfderror = "cannot use capsys and capfd at the same time"
 
 
diff --git a/_pytest/config.py b/_pytest/config.py
index 5df198e21..bd7a03aa8 100644
--- a/_pytest/config.py
+++ b/_pytest/config.py
@@ -65,9 +65,11 @@ def main(args=None, plugins=None):
 class cmdline:  # compatibility namespace
     main = staticmethod(main)
 
+
 class UsageError(Exception):
     """ error in pytest usage or invocation"""
 
+
 _preinit = []
 
 default_plugins = (
@@ -818,9 +820,11 @@ class Notset:
     def __repr__(self):
         return "<NOTSET>"
 
+
 notset = Notset()
 FILE_OR_DIR = 'file_or_dir'
 
+
 class Config(object):
     """ access to configuration values, pluginmanager and plugin hooks.  """
 
@@ -843,9 +847,11 @@ class Config(object):
         self._warn = self.pluginmanager._warn
         self.pluginmanager.register(self, "pytestconfig")
         self._configured = False
+
         def do_setns(dic):
             import pytest
             setns(pytest, dic)
+
         self.hook.pytest_namespace.call_historic(do_setns, {})
         self.hook.pytest_addoption.call_historic(kwargs=dict(parser=self._parser))
 
diff --git a/_pytest/debugging.py b/_pytest/debugging.py
index 299b05028..d96170bd8 100644
--- a/_pytest/debugging.py
+++ b/_pytest/debugging.py
@@ -31,10 +31,12 @@ def pytest_configure(config):
         pytestPDB._pdb_cls = pdb_cls
 
     old = (pdb.set_trace, pytestPDB._pluginmanager)
+
     def fin():
         pdb.set_trace, pytestPDB._pluginmanager = old
         pytestPDB._config = None
         pytestPDB._pdb_cls = pdb.Pdb
+
     pdb.set_trace = pytest.set_trace
     pytestPDB._pluginmanager = config.pluginmanager
     pytestPDB._config = config
diff --git a/_pytest/fixtures.py b/_pytest/fixtures.py
index 3f08b7c6d..28bcd4d8d 100644
--- a/_pytest/fixtures.py
+++ b/_pytest/fixtures.py
@@ -32,11 +32,13 @@ scope2props["function"] = scope2props["instance"] + ("function", "keywords")
 def scopeproperty(name=None, doc=None):
     def decoratescope(func):
         scopename = name or func.__name__
+
         def provide(self):
             if func.__name__ in scope2props[self.scope]:
                 return func(self)
             raise AttributeError("%s not available in %s-scoped context" % (
                 scopename, self.scope))
+
         return property(provide, None, None, func.__doc__)
     return decoratescope
 
diff --git a/_pytest/helpconfig.py b/_pytest/helpconfig.py
index 538a763ca..dd161275b 100644
--- a/_pytest/helpconfig.py
+++ b/_pytest/helpconfig.py
@@ -41,12 +41,14 @@ def pytest_cmdline_parse():
         config.trace.root.setwriter(debugfile.write)
         undo_tracing = config.pluginmanager.enable_tracing()
         sys.stderr.write("writing pytestdebug information to %s\n" % path)
+
         def unset_tracing():
             debugfile.close()
             sys.stderr.write("wrote pytestdebug information to %s\n" %
                              debugfile.name)
             config.trace.root.setwriter(None)
             undo_tracing()
+
         config.add_cleanup(unset_tracing)
 
 def pytest_cmdline_main(config):
diff --git a/_pytest/junitxml.py b/_pytest/junitxml.py
index 97d0675a6..4b9103949 100644
--- a/_pytest/junitxml.py
+++ b/_pytest/junitxml.py
@@ -27,6 +27,7 @@ else:
 class Junit(py.xml.Namespace):
     pass
 
+
 # We need to get the subset of the invalid unicode ranges according to
 # XML 1.0 which are valid in this python build.  Hence we calculate
 # this dynamically instead of hardcoding it.  The spec range of valid
diff --git a/_pytest/mark.py b/_pytest/mark.py
index 640c4e61c..357a60492 100644
--- a/_pytest/mark.py
+++ b/_pytest/mark.py
@@ -54,6 +54,8 @@ def pytest_cmdline_main(config):
             tw.line()
         config._ensure_unconfigure()
         return 0
+
+
 pytest_cmdline_main.tryfirst = True
 
 
diff --git a/_pytest/pastebin.py b/_pytest/pastebin.py
index 4ec62d022..9f1cf9063 100644
--- a/_pytest/pastebin.py
+++ b/_pytest/pastebin.py
@@ -11,6 +11,7 @@ def pytest_addoption(parser):
         choices=['failed', 'all'],
         help="send failed|all info to bpaste.net pastebin service.")
 
+
 @pytest.hookimpl(trylast=True)
 def pytest_configure(config):
     import py
@@ -23,13 +24,16 @@ def pytest_configure(config):
             # pastebin file will be utf-8 encoded binary file
             config._pastebinfile = tempfile.TemporaryFile('w+b')
             oldwrite = tr._tw.write
+
             def tee_write(s, **kwargs):
                 oldwrite(s, **kwargs)
                 if py.builtin._istext(s):
                     s = s.encode('utf-8')
                 config._pastebinfile.write(s)
+
             tr._tw.write = tee_write
 
+
 def pytest_unconfigure(config):
     if hasattr(config, '_pastebinfile'):
         # get terminal contents and delete file
@@ -45,6 +49,7 @@ def pytest_unconfigure(config):
         pastebinurl = create_new_paste(sessionlog)
         tr.write_line("pastebin session-log: %s\n" % pastebinurl)
 
+
 def create_new_paste(contents):
     """
     Creates a new paste using bpaste.net service.
@@ -72,6 +77,7 @@ def create_new_paste(contents):
     else:
         return 'bad response: ' + response
 
+
 def pytest_terminal_summary(terminalreporter):
     import _pytest.config
     if terminalreporter.config.option.pastebin != "failed":
diff --git a/_pytest/pytester.py b/_pytest/pytester.py
index a8bb39794..8aa5c0c4f 100644
--- a/_pytest/pytester.py
+++ b/_pytest/pytester.py
@@ -479,10 +479,12 @@ class Testdir:
         for name, value in items:
             p = self.tmpdir.join(name).new(ext=ext)
             source = Source(value)
+
             def my_totext(s, encoding="utf-8"):
                 if py.builtin._isbytes(s):
                     s = py.builtin._totext(s, encoding=encoding)
                 return s
+
             source_unicode = "\n".join([my_totext(line) for line in source.lines])
             source = py.builtin._totext(source_unicode)
             content = source.strip().encode("utf-8") # + "\n"
@@ -692,12 +694,15 @@ class Testdir:
         # warning which will trigger to say they can no longer be
         # re-written, which is fine as they are already re-written.
         orig_warn = AssertionRewritingHook._warn_already_imported
+
         def revert():
             AssertionRewritingHook._warn_already_imported = orig_warn
+
         self.request.addfinalizer(revert)
         AssertionRewritingHook._warn_already_imported = lambda *a: None
 
         rec = []
+
         class Collect:
             def pytest_configure(x, config):
                 rec.append(self.make_hook_recorder(config.pluginmanager))
@@ -732,10 +737,13 @@ class Testdir:
             try:
                 reprec = self.inline_run(*args, **kwargs)
             except SystemExit as e:
+
                 class reprec:
                     ret = e.args[0]
+
             except Exception:
                 traceback.print_exc()
+
                 class reprec:
                     ret = 3
         finally:
diff --git a/_pytest/python.py b/_pytest/python.py
index 18432c1e7..88c65b1ce 100644
--- a/_pytest/python.py
+++ b/_pytest/python.py
@@ -214,9 +214,12 @@ class PyobjMixin(PyobjContext):
             if obj is None:
                 self._obj = obj = self._getobj()
             return obj
+
         def fset(self, value):
             self._obj = value
+
         return property(fget, fset, None, "underlying python object")
+
     obj = obj()
 
     def _getobj(self):
diff --git a/_pytest/runner.py b/_pytest/runner.py
index d1a155415..eb29e7370 100644
--- a/_pytest/runner.py
+++ b/_pytest/runner.py
@@ -515,8 +515,10 @@ def exit(msg):
     __tracebackhide__ = True
     raise Exit(msg)
 
+
 exit.Exception = Exit
 
+
 def skip(msg=""):
     """ skip an executing test with the given message.  Note: it's usually
     better to use the pytest.mark.skipif marker to declare a test to be
@@ -525,8 +527,11 @@ def skip(msg=""):
     """
     __tracebackhide__ = True
     raise Skipped(msg=msg)
+
+
 skip.Exception = Skipped
 
+
 def fail(msg="", pytrace=True):
     """ explicitly fail an currently-executing test with the given Message.
 
@@ -535,6 +540,8 @@ def fail(msg="", pytrace=True):
     """
     __tracebackhide__ = True
     raise Failed(msg=msg, pytrace=pytrace)
+
+
 fail.Exception = Failed
 
 
diff --git a/_pytest/skipping.py b/_pytest/skipping.py
index 2f000b7b9..a8eaea98a 100644
--- a/_pytest/skipping.py
+++ b/_pytest/skipping.py
@@ -25,8 +25,10 @@ def pytest_configure(config):
     if config.option.runxfail:
         old = pytest.xfail
         config._cleanup.append(lambda: setattr(pytest, "xfail", old))
+
         def nop(*args, **kwargs):
             pass
+
         nop.Exception = XFailed
         setattr(pytest, "xfail", nop)
 
@@ -65,6 +67,8 @@ def xfail(reason=""):
     """ xfail an executing test or setup functions with the given reason."""
     __tracebackhide__ = True
     raise XFailed(reason)
+
+
 xfail.Exception = XFailed
 
 
diff --git a/_pytest/tmpdir.py b/_pytest/tmpdir.py
index 5c0802508..28a6b0636 100644
--- a/_pytest/tmpdir.py
+++ b/_pytest/tmpdir.py
@@ -81,6 +81,7 @@ def get_user():
     except (ImportError, KeyError):
         return None
 
+
 # backward compatibility
 TempdirHandler = TempdirFactory
 
diff --git a/_pytest/unittest.py b/_pytest/unittest.py
index 4355efe70..73224010b 100644
--- a/_pytest/unittest.py
+++ b/_pytest/unittest.py
@@ -186,6 +186,7 @@ def pytest_runtest_protocol(item):
         ut = sys.modules['twisted.python.failure']
         Failure__init__ = ut.Failure.__init__
         check_testcase_implements_trial_reporter()
+
         def excstore(self, exc_value=None, exc_type=None, exc_tb=None,
             captureVars=None):
             if exc_value is None:
@@ -199,6 +200,7 @@ def pytest_runtest_protocol(item):
                     captureVars=captureVars)
             except TypeError:
                 Failure__init__(self, exc_value, exc_type, exc_tb)
+
         ut.Failure.__init__ = excstore
         yield
         ut.Failure.__init__ = Failure__init__
diff --git a/testing/code/test_code.py b/testing/code/test_code.py
index 6f1d9d3cc..ad9db6d2e 100644
--- a/testing/code/test_code.py
+++ b/testing/code/test_code.py
@@ -24,6 +24,7 @@ def test_code_with_class():
         pass
     pytest.raises(TypeError, "_pytest._code.Code(A)")
 
+
 if True:
     def x():
         pass
@@ -68,8 +69,10 @@ def test_code_from_func():
 
 def test_unicode_handling():
     value = py.builtin._totext('\xc4\x85\xc4\x87\n', 'utf-8').encode('utf8')
+
     def f():
         raise Exception(value)
+
     excinfo = pytest.raises(Exception, f)
     str(excinfo)
     if sys.version_info[0] < 3:
@@ -79,8 +82,10 @@ def test_unicode_handling():
 @pytest.mark.skipif(sys.version_info[0] >= 3, reason='python 2 only issue')
 def test_unicode_handling_syntax_error():
     value = py.builtin._totext('\xc4\x85\xc4\x87\n', 'utf-8').encode('utf8')
+
     def f():
         raise SyntaxError('invalid syntax', (None, 1, 3, value))
+
     excinfo = pytest.raises(Exception, f)
     str(excinfo)
     if sys.version_info[0] < 3:
diff --git a/testing/code/test_excinfo.py b/testing/code/test_excinfo.py
index 3aae9c71c..c72b87428 100644
--- a/testing/code/test_excinfo.py
+++ b/testing/code/test_excinfo.py
@@ -56,8 +56,10 @@ def test_excinfo_simple():
 def test_excinfo_getstatement():
     def g():
         raise ValueError
+
     def f():
         g()
+
     try:
         f()
     except ValueError:
@@ -168,11 +170,13 @@ class TestTraceback_f_g_h:
             #
             raise ValueError
             #
+
         def g():
             #
             __tracebackhide__ = tracebackhide
             f()
             #
+
         def h():
             #
             g()
@@ -214,15 +218,18 @@ class TestTraceback_f_g_h:
     def test_traceback_no_recursion_index(self):
         def do_stuff():
             raise RuntimeError
+
         def reraise_me():
             import sys
             exc, val, tb = sys.exc_info()
             py.builtin._reraise(exc, val, tb)
+
         def f(n):
             try:
                 do_stuff()
             except:
                 reraise_me()
+
         excinfo = pytest.raises(RuntimeError, f, 8)
         traceback = excinfo.traceback
         recindex = traceback.recursionindex()
@@ -245,17 +252,18 @@ class TestTraceback_f_g_h:
         excinfo = pytest.raises(ValueError, fail)
         assert excinfo.traceback.recursionindex() is None
 
-
-
     def test_traceback_getcrashentry(self):
         def i():
             __tracebackhide__ = True
             raise ValueError
+
         def h():
             i()
+
         def g():
             __tracebackhide__ = True
             h()
+
         def f():
             g()
 
@@ -271,6 +279,7 @@ class TestTraceback_f_g_h:
         def g():
             __tracebackhide__ = True
             raise ValueError
+
         def f():
             __tracebackhide__ = True
             g()
@@ -465,11 +474,13 @@ raise ValueError()
         class FakeCode(object):
             class raw:
                 co_filename = '?'
+
             path = '?'
             firstlineno = 5
 
             def fullsource(self):
                 return None
+
             fullsource = property(fullsource)
 
         class FakeFrame(object):
@@ -491,17 +502,21 @@ raise ValueError()
         class FakeExcinfo(_pytest._code.ExceptionInfo):
             typename = "Foo"
             value = Exception()
+
             def __init__(self):
                 pass
 
             def exconly(self, tryshort):
                 return "EXC"
+
             def errisinstance(self, cls):
                 return False
 
         excinfo = FakeExcinfo()
+
         class FakeRawTB(object):
             tb_next = None
+
         tb = FakeRawTB()
         excinfo.traceback = Traceback(tb)
 
@@ -719,8 +734,10 @@ raise ValueError()
         excinfo = pytest.raises(ValueError, mod.entry)
 
         p = FormattedExcinfo()
+
         def raiseos():
             raise OSError(2)
+
         monkeypatch.setattr(py.std.os, 'getcwd', raiseos)
         assert p._makepath(__file__) == __file__
         p.repr_traceback(excinfo)
@@ -789,9 +806,11 @@ raise ValueError()
 
     def test_reprexcinfo_unicode(self):
         from _pytest._code.code import TerminalRepr
+
         class MyRepr(TerminalRepr):
             def toterminal(self, tw):
                 tw.line(py.builtin._totext("я", "utf-8"))
+
         x = py.builtin._totext(MyRepr())
         assert x == py.builtin._totext("я", "utf-8")
 
diff --git a/testing/python/collect.py b/testing/python/collect.py
index 2913b11a4..1e69f2da9 100644
--- a/testing/python/collect.py
+++ b/testing/python/collect.py
@@ -383,10 +383,13 @@ class TestFunction:
         config = testdir.parseconfigure()
         session = testdir.Session(config)
         session._fixturemanager = FixtureManager(session)
+
         def func1():
             pass
+
         def func2():
             pass
+
         f1 = pytest.Function(name="name", parent=session, config=config,
                 args=(1,), callobj=func1)
         assert f1 == f1
@@ -547,12 +550,15 @@ class TestFunction:
     def test_pyfunc_call(self, testdir):
         item = testdir.getitem("def test_func(): raise ValueError")
         config = item.config
+
         class MyPlugin1:
             def pytest_pyfunc_call(self, pyfuncitem):
                 raise ValueError
+
         class MyPlugin2:
             def pytest_pyfunc_call(self, pyfuncitem):
                 return True
+
         config.pluginmanager.register(MyPlugin1())
         config.pluginmanager.register(MyPlugin2())
         config.hook.pytest_runtest_setup(item=item)
diff --git a/testing/python/fixture.py b/testing/python/fixture.py
index d6b7840c6..be99ed833 100644
--- a/testing/python/fixture.py
+++ b/testing/python/fixture.py
@@ -10,15 +10,20 @@ from _pytest import fixtures
 def test_getfuncargnames():
     def f(): pass
     assert not fixtures.getfuncargnames(f)
+
     def g(arg): pass
     assert fixtures.getfuncargnames(g) == ('arg',)
+
     def h(arg1, arg2="hello"): pass
     assert fixtures.getfuncargnames(h) == ('arg1',)
+
     def h(arg1, arg2, arg3="hello"): pass
     assert fixtures.getfuncargnames(h) == ('arg1', 'arg2')
+
     class A:
         def f(self, arg1, arg2="hello"):
             pass
+
     assert fixtures.getfuncargnames(A().f) == ('arg1',)
     if sys.version_info < (3,0):
         assert fixtures.getfuncargnames(A.f) == ('arg1',)
@@ -869,8 +874,10 @@ class TestRequestCachedSetup:
         item1 = testdir.getitem("def test_func(): pass")
         req1 = fixtures.FixtureRequest(item1)
         l = ["hello", "world"]
+
         def setup():
             return l.pop()
+
         ret1 = req1.cached_setup(setup, extrakey=1)
         ret2 = req1.cached_setup(setup, extrakey=2)
         assert ret2 == "hello"
@@ -884,10 +891,13 @@ class TestRequestCachedSetup:
         item1 = testdir.getitem("def test_func(): pass")
         req1 = fixtures.FixtureRequest(item1)
         l = []
+
         def setup():
             l.append("setup")
+
         def teardown(val):
             l.append("teardown")
+
         req1.cached_setup(setup, teardown, scope="function")
         assert l == ['setup']
         # artificial call of finalizer
diff --git a/testing/python/integration.py b/testing/python/integration.py
index 237becd6f..6697342ea 100644
--- a/testing/python/integration.py
+++ b/testing/python/integration.py
@@ -63,10 +63,12 @@ class TestOEJSKITSpecials:
 def test_wrapped_getfslineno():
     def func():
         pass
+
     def wrap(f):
         func.__wrapped__ = f
         func.patchings = ["qwe"]
         return func
+
     @wrap
     def wrapped_func(x, y, z):
         pass
@@ -77,28 +79,36 @@ def test_wrapped_getfslineno():
 class TestMockDecoration:
     def test_wrapped_getfuncargnames(self):
         from _pytest.compat import getfuncargnames
+
         def wrap(f):
+
             def func():
                 pass
+
             func.__wrapped__ = f
             return func
+
         @wrap
         def f(x):
             pass
+
         l = getfuncargnames(f)
         assert l == ("x",)
 
     def test_wrapped_getfuncargnames_patching(self):
         from _pytest.compat import getfuncargnames
+
         def wrap(f):
             def func():
                 pass
             func.__wrapped__ = f
             func.patchings = ["qwe"]
             return func
+
         @wrap
         def f(x, y, z):
             pass
+
         l = getfuncargnames(f)
         assert l == ("y", "z")
 
diff --git a/testing/python/metafunc.py b/testing/python/metafunc.py
index 9d71df20a..a7e1d5699 100644
--- a/testing/python/metafunc.py
+++ b/testing/python/metafunc.py
@@ -20,8 +20,10 @@ class TestMetafunc:
         # initiliazation
         class FixtureInfo:
             name2fixturedefs = None
+
             def __init__(self, names):
                 self.names_closure = names
+
         names = fixtures.getfuncargnames(func)
         fixtureinfo = FixtureInfo(names)
         return python.Metafunc(func, fixtureinfo, None)
@@ -65,7 +67,9 @@ class TestMetafunc:
     def test_addcall_param(self):
         def func(arg1): pass
         metafunc = self.Metafunc(func)
+
         class obj: pass
+
         metafunc.addcall(param=obj)
         metafunc.addcall(param=obj)
         metafunc.addcall(param=1)
@@ -76,8 +80,11 @@ class TestMetafunc:
 
     def test_addcall_funcargs(self):
         def func(x): pass
+
         metafunc = self.Metafunc(func)
+
         class obj: pass
+
         metafunc.addcall(funcargs={"x": 2})
         metafunc.addcall(funcargs={"x": 3})
         pytest.raises(pytest.fail.Exception, "metafunc.addcall({'xyz': 0})")
@@ -142,8 +149,10 @@ class TestMetafunc:
     def test_parametrize_with_userobjects(self):
         def func(x, y): pass
         metafunc = self.Metafunc(func)
+
         class A:
             pass
+
         metafunc.parametrize("x", [A(), A()])
         metafunc.parametrize("y", list("ab"))
         assert metafunc._calls[0].id == "x0-a"
@@ -254,6 +263,7 @@ class TestMetafunc:
     @pytest.mark.issue351
     def test_idmaker_idfn(self):
         from _pytest.python import idmaker
+
         def ids(val):
             if isinstance(val, Exception):
                 return repr(val)
@@ -270,6 +280,7 @@ class TestMetafunc:
     @pytest.mark.issue351
     def test_idmaker_idfn_unique_names(self):
         from _pytest.python import idmaker
+
         def ids(val):
             return 'a'
 
@@ -285,6 +296,7 @@ class TestMetafunc:
     @pytest.mark.issue351
     def test_idmaker_idfn_exception(self):
         from _pytest.python import idmaker
+
         def ids(val):
             raise Exception("bad code")
 
diff --git a/testing/test_assertion.py b/testing/test_assertion.py
index 48cd26f02..c63f26b9c 100644
--- a/testing/test_assertion.py
+++ b/testing/test_assertion.py
@@ -12,12 +12,15 @@ PY3 = sys.version_info >= (3, 0)
 
 @pytest.fixture
 def mock_config():
+
     class Config(object):
         verbose = False
+
         def getoption(self, name):
             if name == 'verbose':
                 return self.verbose
             raise KeyError('Not mocked out: %s' % name)
+
     return Config()
 
 
diff --git a/testing/test_assertrewrite.py b/testing/test_assertrewrite.py
index e72266a18..483d80b3d 100644
--- a/testing/test_assertrewrite.py
+++ b/testing/test_assertrewrite.py
@@ -104,20 +104,29 @@ class TestAssertionRewrite:
         def f():
             assert False
         assert getmsg(f) == "assert False"
+
         def f():
             f = False
             assert f
+
         assert getmsg(f) == "assert False"
+
         def f():
             assert a_global  # noqa
+
         assert getmsg(f, {"a_global" : False}) == "assert False"
+
         def f():
             assert sys == 42
+
         assert getmsg(f, {"sys" : sys}) == "assert sys == 42"
+
         def f():
             assert cls == 42  # noqa
+
         class X(object):
             pass
+
         assert getmsg(f, {"cls" : X}) == "assert cls == 42"
 
     def test_assert_already_has_message(self):
@@ -190,78 +199,110 @@ class TestAssertionRewrite:
         def f():
             f = g = False
             assert f and g
+
         assert getmsg(f) == "assert (False)"
+
         def f():
             f = True
             g = False
             assert f and g
+
         assert getmsg(f) == "assert (True and False)"
+
         def f():
             f = False
             g = True
             assert f and g
+
         assert getmsg(f) == "assert (False)"
+
         def f():
             f = g = False
             assert f or g
+
         assert getmsg(f) == "assert (False or False)"
+
         def f():
             f = g = False
             assert not f and not g
+
         getmsg(f, must_pass=True)
+
         def x():
             return False
+
         def f():
             assert x() and x()
+
         assert getmsg(f, {"x" : x}) == """assert (False)
  +  where False = x()"""
+
         def f():
             assert False or x()
+
         assert getmsg(f, {"x" : x}) == """assert (False or False)
  +  where False = x()"""
+
         def f():
             assert 1 in {} and 2 in {}
+
         assert getmsg(f) == "assert (1 in {})"
+
         def f():
             x = 1
             y = 2
             assert x in {1 : None} and y in {}
+
         assert getmsg(f) == "assert (1 in {1: None} and 2 in {})"
+
         def f():
             f = True
             g = False
             assert f or g
+
         getmsg(f, must_pass=True)
+
         def f():
             f = g = h = lambda: True
             assert f() and g() and h()
+
         getmsg(f, must_pass=True)
 
     def test_short_circut_evaluation(self):
         def f():
             assert True or explode  # noqa
+
         getmsg(f, must_pass=True)
+
         def f():
             x = 1
             assert x == 1 or x == 2
+
         getmsg(f, must_pass=True)
 
     def test_unary_op(self):
         def f():
             x = True
             assert not x
+
         assert getmsg(f) == "assert not True"
+
         def f():
             x = 0
             assert ~x + 1
+
         assert getmsg(f) == "assert (~0 + 1)"
+
         def f():
             x = 3
             assert -x + x
+
         assert getmsg(f) == "assert (-3 + 3)"
+
         def f():
             x = 0
             assert +x + x
+
         assert getmsg(f) == "assert (+0 + 0)"
 
     def test_binary_op(self):
@@ -269,7 +310,9 @@ class TestAssertionRewrite:
             x = 1
             y = -1
             assert x + y
+
         assert getmsg(f) == "assert (1 + -1)"
+
         def f():
             assert not 5 % 4
         assert getmsg(f) == "assert not (5 % 4)"
@@ -277,7 +320,9 @@ class TestAssertionRewrite:
     def test_boolop_percent(self):
         def f():
             assert 3 % 2 and False
+
         assert getmsg(f) == "assert ((3 % 2) and False)"
+
         def f():
             assert False or 4 % 2
         assert getmsg(f) == "assert (False or (4 % 2))"
@@ -298,113 +343,159 @@ class TestAssertionRewrite:
     def test_call(self):
         def g(a=42, *args, **kwargs):
             return False
+
         ns = {"g" : g}
+
         def f():
             assert g()
+
         assert getmsg(f, ns) == """assert False
  +  where False = g()"""
+
         def f():
             assert g(1)
+
         assert getmsg(f, ns) == """assert False
  +  where False = g(1)"""
+
         def f():
             assert g(1, 2)
+
         assert getmsg(f, ns) == """assert False
  +  where False = g(1, 2)"""
+
         def f():
             assert g(1, g=42)
+
         assert getmsg(f, ns) == """assert False
  +  where False = g(1, g=42)"""
+
         def f():
             assert g(1, 3, g=23)
+
         assert getmsg(f, ns) == """assert False
  +  where False = g(1, 3, g=23)"""
+
         def f():
             seq = [1, 2, 3]
             assert g(*seq)
+
         assert getmsg(f, ns) == """assert False
  +  where False = g(*[1, 2, 3])"""
+
         def f():
             x = "a"
             assert g(**{x : 2})
+
         assert getmsg(f, ns) == """assert False
  +  where False = g(**{'a': 2})"""
 
     def test_attribute(self):
         class X(object):
             g = 3
+
         ns = {"x" : X}
+
         def f():
             assert not x.g # noqa
+
         assert getmsg(f, ns) == """assert not 3
  +  where 3 = x.g"""
+
         def f():
             x.a = False  # noqa
             assert x.a   # noqa
+
         assert getmsg(f, ns) == """assert False
  +  where False = x.a"""
 
     def test_comparisons(self):
+
         def f():
             a, b = range(2)
             assert b < a
+
         assert getmsg(f) == """assert 1 < 0"""
+
         def f():
             a, b, c = range(3)
             assert a > b > c
+
         assert getmsg(f) == """assert 0 > 1"""
+
         def f():
             a, b, c = range(3)
             assert a < b > c
+
         assert getmsg(f) == """assert 1 > 2"""
+
         def f():
             a, b, c = range(3)
             assert a < b <= c
+
         getmsg(f, must_pass=True)
+
         def f():
             a, b, c = range(3)
             assert a < b
             assert b < c
+
         getmsg(f, must_pass=True)
 
     def test_len(self):
+
         def f():
             l = list(range(10))
             assert len(l) == 11
+
         assert getmsg(f).startswith("""assert 10 == 11
  +  where 10 = len([""")
 
     def test_custom_reprcompare(self, monkeypatch):
         def my_reprcompare(op, left, right):
             return "42"
+
         monkeypatch.setattr(util, "_reprcompare", my_reprcompare)
+
         def f():
             assert 42 < 3
+
         assert getmsg(f) == "assert 42"
+
         def my_reprcompare(op, left, right):
             return "%s %s %s" % (left, op, right)
+
         monkeypatch.setattr(util, "_reprcompare", my_reprcompare)
+
         def f():
             assert 1 < 3 < 5 <= 4 < 7
+
         assert getmsg(f) == "assert 5 <= 4"
 
     def test_assert_raising_nonzero_in_comparison(self):
         def f():
             class A(object):
+
                 def __nonzero__(self):
                     raise ValueError(42)
+
                 def __lt__(self, other):
                     return A()
+
                 def __repr__(self):
                     return "<MY42 object>"
+
             def myany(x):
                 return False
+
             assert myany(A() < 0)
+
         assert "<MY42 object> < 0" in getmsg(f)
 
     def test_formatchar(self):
         def f():
             assert "%test" == "test"
+
         assert getmsg(f).startswith("assert '%test' == 'test'")
 
     def test_custom_repr(self):
@@ -414,8 +505,10 @@ class TestAssertionRewrite:
 
                 def __repr__(self):
                     return "\n{ \n~ \n}"
+
             f = Foo()
             assert 0 == f.a
+
         assert r"where 1 = \n{ \n~ \n}.a" in util._format_lines([getmsg(f)])[0]
 
 
@@ -527,8 +620,10 @@ def test_rewritten():
     def test_rewrite_warning(self, pytestconfig, monkeypatch):
         hook = AssertionRewritingHook(pytestconfig)
         warnings = []
+
         def mywarn(code, msg):
             warnings.append((code, msg))
+
         monkeypatch.setattr(hook.config, 'warn', mywarn)
         hook.mark_rewrite('_pytest')
         assert '_pytest' in warnings[0][1]
@@ -642,10 +737,12 @@ class TestAssertionRewriteHookDetails(object):
         source_path = tmpdir.ensure("source.py")
         pycpath = tmpdir.join("pyc").strpath
         assert _write_pyc(state, [1], source_path.stat(), pycpath)
+
         def open(*args):
             e = IOError()
             e.errno = 10
             raise e
+
         monkeypatch.setattr(b, "open", open)
         assert not _write_pyc(state, [1], source_path.stat(), pycpath)
 
diff --git a/testing/test_collection.py b/testing/test_collection.py
index 71a64c3c9..9cf4de895 100644
--- a/testing/test_collection.py
+++ b/testing/test_collection.py
@@ -150,11 +150,13 @@ class TestCollectFS:
 class TestCollectPluginHookRelay:
     def test_pytest_collect_file(self, testdir):
         wascalled = []
+
         class Plugin:
             def pytest_collect_file(self, path, parent):
                 if not path.basename.startswith("."):
                     # Ignore hidden files, e.g. .testmondata.
                     wascalled.append(path)
+
         testdir.makefile(".abc", "xyz")
         pytest.main([testdir.tmpdir], plugins=[Plugin()])
         assert len(wascalled) == 1
@@ -162,15 +164,18 @@ class TestCollectPluginHookRelay:
 
     def test_pytest_collect_directory(self, testdir):
         wascalled = []
+
         class Plugin:
             def pytest_collect_directory(self, path, parent):
                 wascalled.append(path.basename)
+
         testdir.mkdir("hello")
         testdir.mkdir("world")
         pytest.main(testdir.tmpdir, plugins=[Plugin()])
         assert "hello" in wascalled
         assert "world" in wascalled
 
+
 class TestPrunetraceback:
 
     def test_custom_repr_failure(self, testdir):
diff --git a/testing/test_config.py b/testing/test_config.py
index 83e8f4e6a..75a806c4a 100644
--- a/testing/test_config.py
+++ b/testing/test_config.py
@@ -373,23 +373,31 @@ def test_options_on_small_file_do_not_blow_up(testdir):
                  ['--traceconfig'], ['-v'], ['-v', '-v']):
         runfiletest(opts + [path])
 
+
 def test_preparse_ordering_with_setuptools(testdir, monkeypatch):
     pkg_resources = pytest.importorskip("pkg_resources")
+
     def my_iter(name):
         assert name == "pytest11"
+
         class Dist:
             project_name = 'spam'
             version = '1.0'
+
             def _get_metadata(self, name):
                 return ['foo.txt,sha256=abc,123']
+
         class EntryPoint:
             name = "mytestplugin"
             dist = Dist()
+
             def load(self):
                 class PseudoPlugin:
                     x = 42
                 return PseudoPlugin()
+
         return iter([EntryPoint()])
+
     monkeypatch.setattr(pkg_resources, 'iter_entry_points', my_iter)
     testdir.makeconftest("""
         pytest_plugins = "mytestplugin",
@@ -402,18 +410,24 @@ def test_preparse_ordering_with_setuptools(testdir, monkeypatch):
 
 def test_setuptools_importerror_issue1479(testdir, monkeypatch):
     pkg_resources = pytest.importorskip("pkg_resources")
+
     def my_iter(name):
         assert name == "pytest11"
+
         class Dist:
             project_name = 'spam'
             version = '1.0'
+
             def _get_metadata(self, name):
                 return ['foo.txt,sha256=abc,123']
+
         class EntryPoint:
             name = "mytestplugin"
             dist = Dist()
+
             def load(self):
                 raise ImportError("Don't hide me!")
+
         return iter([EntryPoint()])
 
     monkeypatch.setattr(pkg_resources, 'iter_entry_points', my_iter)
@@ -423,19 +437,26 @@ def test_setuptools_importerror_issue1479(testdir, monkeypatch):
 
 def test_plugin_preparse_prevents_setuptools_loading(testdir, monkeypatch):
     pkg_resources = pytest.importorskip("pkg_resources")
+
     def my_iter(name):
         assert name == "pytest11"
+
         class Dist:
             project_name = 'spam'
             version = '1.0'
+
             def _get_metadata(self, name):
                 return ['foo.txt,sha256=abc,123']
+
         class EntryPoint:
             name = "mytestplugin"
             dist = Dist()
+
             def load(self):
                 assert 0, "should not arrive here"
+
         return iter([EntryPoint()])
+
     monkeypatch.setattr(pkg_resources, 'iter_entry_points', my_iter)
     config = testdir.parseconfig("-p", "no:mytestplugin")
     plugin = config.pluginmanager.getplugin("mytestplugin")
@@ -503,9 +524,11 @@ def test_notify_exception(testdir, capfd):
     config.notify_exception(excinfo)
     out, err = capfd.readouterr()
     assert "ValueError" in err
+
     class A:
         def pytest_internalerror(self, excrepr):
             return True
+
     config.pluginmanager.register(A())
     config.notify_exception(excinfo)
     out, err = capfd.readouterr()
@@ -515,9 +538,11 @@ def test_notify_exception(testdir, capfd):
 def test_load_initial_conftest_last_ordering(testdir):
     from _pytest.config  import get_config
     pm = get_config().pluginmanager
+
     class My:
         def pytest_load_initial_conftests(self):
             pass
+
     m = My()
     pm.register(m)
     hc = pm.hook.pytest_load_initial_conftests
diff --git a/testing/test_conftest.py b/testing/test_conftest.py
index 377283eb9..6dce13859 100644
--- a/testing/test_conftest.py
+++ b/testing/test_conftest.py
@@ -200,8 +200,10 @@ def test_conftest_import_order(testdir, monkeypatch):
     sub = testdir.mkdir("sub")
     ct2 = sub.join("conftest.py")
     ct2.write("")
+
     def impct(p):
         return p
+
     conftest = PytestPluginManager()
     conftest._confcutdir = testdir.tmpdir
     monkeypatch.setattr(conftest, '_importconftest', impct)
diff --git a/testing/test_mark.py b/testing/test_mark.py
index e0bf3c3c8..a4430b4c8 100644
--- a/testing/test_mark.py
+++ b/testing/test_mark.py
@@ -23,15 +23,19 @@ class TestMark:
 
     def test_pytest_mark_bare(self):
         mark = Mark()
+
         def f():
             pass
+
         mark.hello(f)
         assert f.hello
 
     def test_pytest_mark_keywords(self):
         mark = Mark()
+
         def f():
             pass
+
         mark.world(x=3, y=4)(f)
         assert f.world
         assert f.world.kwargs['x'] == 3
@@ -39,8 +43,10 @@ class TestMark:
 
     def test_apply_multiple_and_merge(self):
         mark = Mark()
+
         def f():
             pass
+
         mark.world
         mark.world(x=3)(f)
         assert f.world.kwargs['x'] == 3
@@ -53,33 +59,43 @@ class TestMark:
 
     def test_pytest_mark_positional(self):
         mark = Mark()
+
         def f():
             pass
+
         mark.world("hello")(f)
         assert f.world.args[0] == "hello"
         mark.world("world")(f)
 
     def test_pytest_mark_positional_func_and_keyword(self):
         mark = Mark()
+
         def f():
             raise Exception
+
         m = mark.world(f, omega="hello")
+
         def g():
             pass
+
         assert m(g) == g
         assert g.world.args[0] is f
         assert g.world.kwargs["omega"] == "hello"
 
     def test_pytest_mark_reuse(self):
         mark = Mark()
+
         def f():
             pass
+
         w = mark.some
         w("hello", reason="123")(f)
         assert f.some.args[0] == "hello"
         assert f.some.kwargs['reason'] == "123"
+
         def g():
             pass
+
         w("world", reason2="456")(g)
         assert g.some.args[0] == "world"
         assert 'reason' not in g.some.kwargs
@@ -610,11 +626,12 @@ class TestFunctional:
             def test_1(parameter):
                 assert True
         """)
-
         reprec = testdir.inline_run()
         reprec.assertoutcome(skipped=1)
 
+
 class TestKeywordSelection:
+
     def test_select_simple(self, testdir):
         file_test = testdir.makepyfile("""
             def test_one():
@@ -623,6 +640,7 @@ class TestKeywordSelection:
                 def test_method_one(self):
                     assert 42 == 43
         """)
+
         def check(keyword, name):
             reprec = testdir.inline_run("-s", "-k", keyword, file_test)
             passed, skipped, failed = reprec.listoutcomes()
@@ -709,6 +727,7 @@ class TestKeywordSelection:
         p = testdir.makepyfile("""
             def test_one(): assert 1
         """)
+
         def assert_test_is_not_selected(keyword):
             reprec = testdir.inline_run("-k", keyword, p)
             passed, skipped, failed = reprec.countoutcomes()
diff --git a/testing/test_nose.py b/testing/test_nose.py
index a5162381e..f54246111 100644
--- a/testing/test_nose.py
+++ b/testing/test_nose.py
@@ -25,18 +25,22 @@ def test_nose_setup(testdir):
 def test_setup_func_with_setup_decorator():
     from _pytest.nose import call_optional
     l = []
+
     class A:
         @pytest.fixture(autouse=True)
         def f(self):
             l.append(1)
+
     call_optional(A(), "f")
     assert not l
 
 
 def test_setup_func_not_callable():
     from _pytest.nose import call_optional
+
     class A:
         f = 1
+
     call_optional(A(), "f")
 
 def test_nose_setup_func(testdir):
diff --git a/testing/test_parseopt.py b/testing/test_parseopt.py
index fc9ded488..e933dbb8d 100644
--- a/testing/test_parseopt.py
+++ b/testing/test_parseopt.py
@@ -138,7 +138,10 @@ class TestParser:
     def test_parse_setoption(self, parser):
         parser.addoption("--hello", dest="hello", action="store")
         parser.addoption("--world", dest="world", default=42)
-        class A: pass
+
+        class A:
+            pass
+
         option = A()
         args = parser.parse_setoption(['--hello', 'world'], option)
         assert option.hello == "world"
diff --git a/testing/test_pastebin.py b/testing/test_pastebin.py
index 03570a5c7..8123424ca 100644
--- a/testing/test_pastebin.py
+++ b/testing/test_pastebin.py
@@ -84,8 +84,10 @@ class TestPaste:
         function that connects to bpaste service.
         """
         calls = []
+
         def mocked(url, data):
             calls.append((url, data))
+
             class DummyFile:
                 def read(self):
                     # part of html of a normal response
diff --git a/testing/test_pdb.py b/testing/test_pdb.py
index b22f5128e..df58dad87 100644
--- a/testing/test_pdb.py
+++ b/testing/test_pdb.py
@@ -19,8 +19,10 @@ class TestPDB:
     def pdblist(self, request):
         monkeypatch = request.getfixturevalue("monkeypatch")
         pdblist = []
+
         def mypdb(*args):
             pdblist.append(args)
+
         plugin = request.config.pluginmanager.getplugin('debugging')
         monkeypatch.setattr(plugin, 'post_mortem', mypdb)
         return pdblist
diff --git a/testing/test_pluginmanager.py b/testing/test_pluginmanager.py
index e61c84247..d636102f7 100644
--- a/testing/test_pluginmanager.py
+++ b/testing/test_pluginmanager.py
@@ -83,6 +83,7 @@ class TestPytestPluginInteractions:
     def test_configure(self, testdir):
         config = testdir.parseconfig()
         l = []
+
         class A:
             def pytest_configure(self, config):
                 l.append(self)
@@ -102,13 +103,16 @@ class TestPytestPluginInteractions:
     def test_hook_tracing(self):
         pytestpm = get_config().pluginmanager  # fully initialized with plugins
         saveindent = []
+
         class api1:
             def pytest_plugin_registered(self):
                 saveindent.append(pytestpm.trace.root.indent)
+
         class api2:
             def pytest_plugin_registered(self):
                 saveindent.append(pytestpm.trace.root.indent)
                 raise ValueError()
+
         l = []
         pytestpm.trace.root.setwriter(l.append)
         undo = pytestpm.enable_tracing()
diff --git a/testing/test_pytester.py b/testing/test_pytester.py
index 65660afdf..14548808c 100644
--- a/testing/test_pytester.py
+++ b/testing/test_pytester.py
@@ -11,6 +11,7 @@ def test_make_hook_recorder(testdir):
     assert not recorder.getfailures()
 
     pytest.xfail("internal reportrecorder tests need refactoring")
+
     class rep:
         excinfo = None
         passed = False
@@ -80,10 +81,13 @@ def make_holder():
             "x"
 
     apimod = type(os)('api')
+
     def pytest_xyz(arg):
         "x"
+
     def pytest_xyz_noarg():
         "x"
+
     apimod.pytest_xyz = pytest_xyz
     apimod.pytest_xyz_noarg = pytest_xyz_noarg
     return apiclass, apimod
diff --git a/testing/test_runner.py b/testing/test_runner.py
index e88a548d7..727defa92 100644
--- a/testing/test_runner.py
+++ b/testing/test_runner.py
@@ -38,9 +38,13 @@ class TestSetupState:
 
     def test_teardown_multiple_one_fails(self, testdir):
         r = []
+
         def fin1(): r.append('fin1')
+
         def fin2(): raise Exception('oops')
+
         def fin3(): r.append('fin3')
+
         item = testdir.getitem("def test_func(): pass")
         ss = runner.SetupState()
         ss.addfinalizer(fin1, item)
@@ -55,7 +59,9 @@ class TestSetupState:
         # Ensure the first exception is the one which is re-raised.
         # Ideally both would be reported however.
         def fin1(): raise Exception('oops1')
+
         def fin2(): raise Exception('oops2')
+
         item = testdir.getitem("def test_func(): pass")
         ss = runner.SetupState()
         ss.addfinalizer(fin1, item)
@@ -527,8 +533,10 @@ def test_exception_printing_skip():
 
 def test_importorskip(monkeypatch):
     importorskip = pytest.importorskip
+
     def f():
         importorskip("asdlkj")
+
     try:
         sys = importorskip("sys")  # noqa
         assert sys == py.std.sys
@@ -643,11 +651,13 @@ def test_makereport_getsource_dynamic_code(testdir, monkeypatch):
     """Test that exception in dynamically generated code doesn't break getting the source line."""
     import inspect
     original_findsource = inspect.findsource
+
     def findsource(obj, *args, **kwargs):
         # Can be triggered by dynamically created functions
         if obj.__name__ == 'foo':
             raise IndexError()
         return original_findsource(obj, *args, **kwargs)
+
     monkeypatch.setattr(inspect, 'findsource', findsource)
 
     testdir.makepyfile("""
diff --git a/tox.ini b/tox.ini
index efa3ad2f1..c2f866f26 100644
--- a/tox.ini
+++ b/tox.ini
@@ -175,3 +175,4 @@ norecursedirs = .tox ja .hg cx_freeze_source
 
 [flake8]
 ignore =E401,E225,E261,E128,E124,E301,E302,E121,E303,W391,E501,E231,E126,E701,E265,E241,E251,E226,E101,W191,E131,E203,E122,E123,E271,E712,E222,E127,E125,E221,W292,E111,E113,E293,E262,W293,E129,E702,E201,E272,E202,E704,E731,E402
+exclude = _pytest/vendored_packages/pluggy.py