https://github.com/networkx/networkx/commit/52e7b5d8732c84512f5423661f234790ce7b1b5f
Fix dict iteration for Py3.8

Python 3.8 tracks if any key names change while iterating.
https://github.com/python/cpython/pull/12596

--- networkx/classes/reportviews.py.orig	2019-04-11 14:52:34.000000000 -0600
+++ networkx/classes/reportviews.py	2019-09-11 09:36:56.783002687 -0600
@@ -1025,7 +1025,7 @@ class EdgeView(OutEdgeView):
     def __iter__(self):
         seen = {}
         for n, nbrs in self._nodes_nbrs():
-            for nbr in nbrs:
+            for nbr in list(nbrs):
                 if nbr not in seen:
                     yield (n, nbr)
             seen[n] = 1