https://github.com/networkx/networkx/commit/d27930ce099d6f0edca8d5d91d5f3a8d9dc90c9d

Fix deprecation warning with Python 3.7 (#3487)

Replace collections.Iterable with collections.abc.Iterable to fix deprecation warning with Python 3.7:
"DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working"

--- networkx/drawing/nx_pylab.py.orig	2019-09-11 10:14:12.380878784 -0600
+++ networkx/drawing/nx_pylab.py	2019-09-11 10:14:26.196649773 -0600
@@ -373,7 +373,7 @@ def draw_networkx_nodes(G, pos,
     draw_networkx_labels()
     draw_networkx_edge_labels()
     """
-    import collections
+    from collections.abc import Iterable
     try:
         import matplotlib.pyplot as plt
         import numpy as np
@@ -399,7 +399,7 @@ def draw_networkx_nodes(G, pos,
     except ValueError:
         raise nx.NetworkXError('Bad value in node positions.')
 
-    if isinstance(alpha, collections.Iterable):
+    if isinstance(alpha, Iterable):
         node_color = apply_alpha(node_color, alpha, nodelist, cmap, vmin, vmax)
         alpha = None