Backport PR #12686: Remove deprecation warnings in tests

dstansby · MeeseeksDev[bot] · commit 987dbd67f818 · 2018-10-31T23:28:24.000Z
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -1,4 +1,4 @@
-import collections
+import collections.abc
 import functools
 import itertools
 import logging
@@ -4191,7 +4191,7 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
         if (c_none or
                 co is not None or
                 isinstance(c, str) or
-                (isinstance(c, collections.Iterable) and
+                (isinstance(c, collections.abc.Iterable) and
                     isinstance(c[0], str))):
             c_array = None
         else:
