refact: py3 dict syntax instead if filer()

Author: ankostis

graphtik/network.py

@@ -299,7 +299,7 @@ def _execute_thread_pool_barrier_method(self, solution, overwrites, executed):
                         )
 
             # stop if no nodes left to schedule, exit out of the loop
-            if len(upnext) == 0:
+            if not upnext:
                 break
 
             done_iterator = pool.imap_unordered(

graphtik/nodes.py

@@ -65,9 +65,11 @@ def compute(self, named_inputs, outputs=None):
             results = zip(provides, results)
             if outputs:
                 outputs = set(n for n in outputs if not isinstance(n, sideffect))
-                results = filter(lambda x: x[0] in outputs, results)
+                results = {key: val for key, val in results if key in outputs}
+            else:
+                results = dict(results)
 
-            return dict(results)
+            return results
         except Exception as ex:
             jetsam(
                 ex,