Fix deprecation warning when using collection.MutableMapping

Author: David Sternlicht

libtmux/_compat.py

@@ -35,6 +35,8 @@
     from string import lower as ascii_lowercase
     import urlparse
 
+    from collections import MutableMapping
+
     exec('def reraise(tp, value, tb=None):\n raise tp, value, tb')
 
     def implements_to_string(cls):
@@ -78,6 +80,8 @@ def console_to_str(s):
 
     implements_to_string = _identity
 
+    from collections.abc import MutableMapping
+
     def console_to_str(s):
         """ From pypa/pip project, pip.backwardwardcompat. License MIT. """
         try:

libtmux/common.py

@@ -15,7 +15,7 @@
 from distutils.version import LooseVersion
 
 from . import exc
-from ._compat import console_to_str, str_from_console
+from ._compat import console_to_str, str_from_console, MutableMapping
 
 logger = logging.getLogger(__name__)
 
@@ -231,9 +231,9 @@ def __init__(self, *args, **kwargs):
         logger.debug('self.stdout for %s: \n%s' % (' '.join(cmd), self.stdout))
 
 
-class TmuxMappingObject(collections.MutableMapping):
+class TmuxMappingObject(MutableMapping):
 
-    """Base: :py:class:`collections.MutableMapping`.
+    """Base: :py:class:`MutableMapping`.
 
     Convenience container. Base class for :class:`Pane`, :class:`Window`,
     :class:`Session` and :class:`Server`.