Merge remote-tracking branch 'upstream/master' into merge-master-into-features

# Conflicts:
#	_pytest/capture.py
#	_pytest/compat.py
#	_pytest/python.py
#	testing/python/collect.py
#	testing/test_mark.py

_pytest/_code/code.py

@@ -3,13 +3,14 @@ import sys
 from inspect import CO_VARARGS, CO_VARKEYWORDS
 import re
 from weakref import ref
+from _pytest.compat import _PY2, _PY3, PY35
 
 import py
 builtin_repr = repr
 
 reprlib = py.builtin._tryimport('repr', 'reprlib')
 
-if sys.version_info[0] >= 3:
+if _PY3:
     from traceback import format_exception_only
 else:
     from ._py2traceback import format_exception_only
@@ -353,7 +354,7 @@ class ExceptionInfo(object):
         help for navigating the traceback.
     """
     _striptext = ''
-    _assert_start_repr = "AssertionError(u\'assert " if sys.version_info[0] < 3 else "AssertionError(\'assert "
+    _assert_start_repr = "AssertionError(u\'assert " if _PY2 else "AssertionError(\'assert "
 
     def __init__(self, tup=None, exprinfo=None):
         import _pytest._code
@@ -618,7 +619,7 @@ class FormattedExcinfo(object):
 
 
     def repr_excinfo(self, excinfo):
-        if sys.version_info[0] < 3:
+        if _PY2:
             reprtraceback = self.repr_traceback(excinfo)
             reprcrash = excinfo._getreprcrash()
 
@@ -655,7 +656,7 @@ class FormattedExcinfo(object):
 class TerminalRepr(object):
     def __str__(self):
         s = self.__unicode__()
-        if sys.version_info[0] < 3:
+        if _PY2:
             s = s.encode('utf-8')
         return s
 
@@ -851,7 +852,7 @@ def getrawcode(obj, trycall=True):
         return obj
 
 
-if sys.version_info[:2] >= (3, 5):  # RecursionError introduced in 3.5
+if PY35:  # RecursionError introduced in 3.5
     def is_recursion_error(excinfo):
         return excinfo.errisinstance(RecursionError)  # noqa
 else: