Fixed bug where the functionality of inspect.ismethod changed in Python 3, not…

Fixed bug where the functionality of inspect.ismethod changed in Python 3, not detecting anymore if mpi_dummy is running on more than 1 MPI process.

mpi_dummy/comm.py

@@ -3,6 +3,7 @@
 from __future__ import absolute_import
 from builtins import object
 import inspect
+import sys
 
 import copy
 import numpy as np
@@ -11,11 +12,17 @@ from .op import SUM
 
 __all__ = ['Comm', 'Intracomm', 'COMM_WORLD', 'COMM_SELF']
 
+# Select function for detecting an instance method of a class
+if(sys.version_info.major >= 3):
+    ismethod_func = inspect.isfunction
+else:
+    ismethod_func = inspect.ismethod
+
 SINGLE_THREADED_Q = None
 
 def decorate_all_methods(decorator):
   def decorate_the_class(cls):
-    for name, m in inspect.getmembers(cls, inspect.ismethod):
+    for name, m in inspect.getmembers(cls, ismethod_func):
       if name != '__init__':
         setattr(cls, name, decorator(m))
     return cls