Use exec directly

src/_pytest/_code/code.py

@@ -13,7 +13,6 @@ from weakref import ref
 import attr
 import pluggy
 import py
-import six
 from six import text_type
 
 import _pytest
@@ -138,7 +137,7 @@ class Frame(object):
         """
         f_locals = self.f_locals.copy()
         f_locals.update(vars)
-        six.exec_(code, self.f_globals, f_locals)
+        exec(code, self.f_globals, f_locals)
 
     def repr(self, object):
         """ return a 'safe' (non-recursive, one-line) string repr for 'object'

src/_pytest/assertion/rewrite.py

@@ -296,7 +296,7 @@ class AssertionRewritingHook(object):
             mod.__loader__ = self
             # Normally, this attribute is 3.4+
             mod.__spec__ = spec_from_file_location(name, co.co_filename, loader=self)
-            six.exec_(co, mod.__dict__)
+            exec(co, mod.__dict__)
         except:  # noqa
             if name in sys.modules:
                 del sys.modules[name]

src/_pytest/python_api.py

@@ -7,7 +7,6 @@ import warnings
 from decimal import Decimal
 from numbers import Number
 
-import six
 from more_itertools.more import always_iterable
 from six.moves import filterfalse
 from six.moves import zip
@@ -702,7 +701,7 @@ def raises(expected_exception, *args, **kwargs):
         # print "raises frame scope: %r" % frame.f_locals
         try:
             code = _pytest._code.Source(code).compile(_genframe=frame)
-            six.exec_(code, frame.f_globals, loc)
+            exec(code, frame.f_globals, loc)
             # XXX didn't mean f_globals == f_locals something special?
             #     this is destroyed here ...
         except expected_exception:

src/_pytest/recwarn.py

@@ -102,7 +102,7 @@ def warns(expected_warning, *args, **kwargs):
 
         with WarningsChecker(expected_warning):
             code = _pytest._code.Source(code).compile()
-            six.exec_(code, frame.f_globals, loc)
+            exec(code, frame.f_globals, loc)
     else:
         func = args[0]
         with WarningsChecker(expected_warning):