Add support for Python 3.7

.travis.yml

@@ -13,7 +13,9 @@ python:
   - '3.6'
   - pypy3
 
-install: pip install tox-travis
+install:
+  - if [[ $TRAVIS_PYTHON_VERSION == 3.3 ]]; then pip install virtualenv==15.2.0; fi
+  - pip install tox-travis
 sudo: false
 
 script: tox

callee/collections.py

@@ -3,7 +3,13 @@
 """
 from __future__ import absolute_import
 
-import collections
+try:
+    import collections.abc
+    abc = collections.abc
+except ImportError:
+    import collections
+    abc = collections
+
 import inspect
 
 from callee._compat import OrderedDict as _OrderedDict
@@ -71,7 +77,7 @@ def __repr__(self):
 class Iterable(CollectionMatcher):
     """Matches any iterable."""
 
-    CLASS = collections.Iterable
+    CLASS = abc.Iterable
 
     def __init__(self):
         # Unfortunately, we can't allow an ``of`` argument to this matcher.
@@ -113,7 +119,7 @@ class Sequence(CollectionMatcher):
 
     A sequence is an iterable that has a length and can be indexed.
     """
-    CLASS = collections.Sequence
+    CLASS = abc.Sequence
 
 
 class List(CollectionMatcher):
@@ -125,7 +131,7 @@ class List(CollectionMatcher):
 class Set(CollectionMatcher):
     """Matches a :class:`set` of given items."""
 
-    CLASS = collections.Set
+    CLASS = abc.Set
 
 
 # TODO: Tuple matcher, with of= that accepts a tuple of matchers
@@ -243,7 +249,7 @@ def __repr__(self):
 class Mapping(MappingMatcher):
     """Matches a mapping of given items."""
 
-    CLASS = collections.Mapping
+    CLASS = abc.Mapping
 
 
 class Dict(MappingMatcher):

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion=1.8
-envlist=py26, py27, pypy, py33, py34, py35, py36, pypy3, flake8
+envlist=py26, py27, pypy, py33, py34, py35, py36, py37, pypy3, flake8
 skip_missing_interpreters=true
 
 [testenv]