From cebe42c6e413bff148743763f25106049a1a6a91 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Laurent=20P=2E=20Ren=C3=A9=20de=20Cotret?=
 <laurent.decotret@outlook.com>
Date: Fri, 13 Apr 2018 13:01:04 -0400
Subject: [PATCH] Removed reliance on Python 3.6's AbstractContextManager

---
 iris/raw.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/iris/raw.py b/iris/raw.py
index 7e7047e2..158a4f62 100644
--- a/iris/raw.py
+++ b/iris/raw.py
@@ -5,7 +5,6 @@
 """
 from abc import abstractmethod
 from collections import OrderedDict
-from contextlib import AbstractContextManager
 from functools import partial
 
 import numpy as np
@@ -15,7 +14,7 @@
 
 from .meta import ExperimentalParameter, MetaRawDataset
 
-class AbstractRawDataset(AbstractContextManager, metaclass = MetaRawDataset):
+class AbstractRawDataset(object, metaclass = MetaRawDataset):
     """
     Abstract base class for ultrafast electron diffraction data set. 
     RawDatasetBase allows for enforced metadata types and values, 
@@ -78,6 +77,9 @@ def __init__(self, source = None, metadata = dict()):
         if metadata:
             self.update_metadata(metadata)
     
+    def __enter__(self):
+        return self
+    
     def __exit__(self, *exc):
         pass