chage collections.abc import to fix deprecation warnings on python 3.7

_pytest/assertion/util.py

@@ -5,7 +5,11 @@ import pprint
 import _pytest._code
 import py
 import six
-from collections import Sequence
+import sys
+if sys.version_info >= (3, 4):
+    from collections.abc import Sequence
+else:
+    from collections import Sequence
 
 u = six.text_type
 

_pytest/mark/structures.py

@@ -1,4 +1,9 @@
-from collections import namedtuple, MutableMapping as MappingMixin
+import sys
+if sys.version_info >= (3, 4):
+    from collections.abc import MutableMapping as MappingMixin
+else:
+    from collections import MutableMapping as MappingMixin
+from collections import namedtuple
 import warnings
 from operator import attrgetter
 import inspect