ok for python 3.4

src/jflow/workflow.py

@@ -594,7 +594,7 @@ class Workflow(threading.Thread):
         """
         odict = self.__dict__.copy()
         del odict['_started']
-        del odict['_block']
+        del odict['_tstate_lock']
         del odict['_stderr']
         if 'external_components' in odict:
             del odict['external_components']
@@ -699,7 +699,7 @@ class Workflow(threading.Thread):
         if component_name in self.internal_components or component_name in self.external_components:
             
             if component_name in self.internal_components:
-                my_pckge = __import__(self.internal_components[component_name], globals(), locals(), [component_name], -1)
+                my_pckge = __import__(self.internal_components[component_name], globals(), locals(), [component_name])
                 # build the object and define required field
                 cmpt_object = getattr(my_pckge, component_name)()
                 cmpt_object.output_directory = self.get_component_output_directory(component_name, component_prefix)
@@ -1111,7 +1111,7 @@ class Workflow(threading.Thread):
         """ Import ``symbols`` from ``module`` into global namespace. """
         # Import module
         m = 'weaver.{0}'.format(module)
-        m = __import__(m, self.globals, self.globals, symbols, -1)
+        m = __import__(m, self.globals, self.globals, symbols)
 
         # Import symbols from module into global namespace, which we store as
         # an attribute for later use (i.e. during compile)