Fix: DeprecationWarning: Using or importing the ABCs from 'collections'

  instead of from 'collections.abc' is deprecated, and in 3.8 it will
  stop working

Author: rouilj

roundup/instance.py

@@ -33,7 +33,11 @@
 except ImportError:
     import __builtin__ as builtins
 
-import collections
+try:
+    from collections.abc import Callable
+except ImportError:
+    from collections import Callable
+
 import os
 import sys
 import warnings
@@ -134,14 +138,14 @@ def open(self, name=None):
         if self.optimize:
             # execute preloaded schema object
             self._exec(self.schema, env)
-            if isinstance(self.schema_hook, collections.Callable):
+            if isinstance(self.schema_hook, Callable):
                 self.schema_hook(**env)
             # use preloaded detectors
             detectors = self.detectors
         else:
             # execute the schema file
             self._execfile('schema.py', env)
-            if isinstance(self.schema_hook, collections.Callable):
+            if isinstance(self.schema_hook, Callable):
                 self.schema_hook(**env)
             # reload extensions and detectors
             for extension in self.get_extensions('extensions'):