From 55f954318c082346b490f408c5e3f8e3638929bf Mon Sep 17 00:00:00 2001
From: Dekara VanHoc <50260825+dekaravanhoc@users.noreply.github.com>
Date: Thu, 20 Jan 2022 15:34:56 +0100
Subject: [PATCH] Update to collection.abc

Updates to collection.abc for instance check
Adds try/except for backwardscompatibility
---
 backtrader/cerebro.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/backtrader/cerebro.py b/backtrader/cerebro.py
index 2790ef1b7..4b1b93bbf 100644
--- a/backtrader/cerebro.py
+++ b/backtrader/cerebro.py
@@ -26,6 +26,11 @@
 import itertools
 import multiprocessing
 
+try:
+    collectionsAbc = collections.abc
+except AttributeError:
+    collectionsAbc = collections
+
 import backtrader as bt
 from .utils.py3 import (map, range, zip, with_metaclass, string_types,
                         integer_types)
@@ -330,7 +335,7 @@ def iterize(iterable):
         for elem in iterable:
             if isinstance(elem, string_types):
                 elem = (elem,)
-            elif not isinstance(elem, collections.Iterable):
+            elif not isinstance(elem, collectionsAbc.Iterable):
                 elem = (elem,)
 
             niterable.append(elem)