No bug: [taskgrah] Fix mach taskgraph full --tasks <...> on python 3; r=Callek DONTBUILD

Differential Revision: https://phabricator.services.mozilla.com/D85895

taskcluster/mach_commands.py

@@ -12,6 +12,7 @@ import json
 import logging
 import os
 from six import text_type
+import six
 import sys
 import traceback
 import re
@@ -389,7 +390,7 @@ class MachCommands(MachCommandBase):
             task = taskgraph.tasks[key]
             if regexprogram.match(task.label):
                 filteredtasks[key] = task
-                for depname, dep in named_links_dict[key].iteritems():
+                for depname, dep in six.iteritems(named_links_dict[key]):
                     if regexprogram.match(dep):
                         filterededges.add((key, dep, depname))
         filtered_taskgraph = TaskGraph(filteredtasks, Graph(set(filteredtasks), filterededges))