Fix DeprecationWarning related to collections.Mapping

This warning got reported in #367
alecthomas · Dec 14, 2018 · e6ef8af · e6ef8af
1 parent e72fd3b
commit e6ef8af
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/voluptuous/schema_builder.py b/voluptuous/schema_builder.py
@@ -22,6 +22,11 @@ def iteritems(d):
     def iteritems(d):
         return d.iteritems()
 
+if sys.version_info >= (3, 3):
+    _Mapping = collections.abc.Mapping
+else:
+    _Mapping = collections.Mapping
+
 """Schema validation for Python data structures.
 
 Given eg. a nested data structure like this:
@@ -280,7 +285,7 @@ def _compile(self, schema):
             return schema.__voluptuous_compile__(self)
         if isinstance(schema, Object):
             return self._compile_object(schema)
-        if isinstance(schema, collections.Mapping):
+        if isinstance(schema, _Mapping):
             return self._compile_dict(schema)
         elif isinstance(schema, list):
             return self._compile_list(schema)