Added support for recent CPython and PyPy versions; Droped Python v2.7 Support (#680)

test/test_plugin_mailgun.py

@@ -24,14 +24,7 @@
 # THE SOFTWARE.
 
 import os
-import sys
-try:
-    # Python 3.x
-    from unittest import mock
-
-except ImportError:
-    # Python 2.7
-    import mock
+from unittest import mock
 
 import requests
 from helpers import AppriseURLTester
@@ -225,13 +218,6 @@ def test_plugin_mailgun_attachments(mock_post):
         body='body', title='title', notify_type=NotifyType.INFO,
         attach=attach) is False
 
-    # Get a appropriate "builtin" module name for pythons 2/3.
-    if sys.version_info.major >= 3:
-        builtin_open_function = 'builtins.open'
-
-    else:
-        builtin_open_function = '__builtin__.open'
-
     # Test Valid Attachment (load 3)
     path = (
         os.path.join(TEST_VAR_DIR, 'apprise-test.gif'),
@@ -243,7 +229,7 @@ def test_plugin_mailgun_attachments(mock_post):
     # Return our good configuration
     mock_post.side_effect = None
     mock_post.return_value = okay_response
-    with mock.patch(builtin_open_function, side_effect=OSError()):
+    with mock.patch('builtins.open', side_effect=OSError()):
         # We can't send the message we can't open the attachment for reading
         assert obj.notify(
             body='body', title='title', notify_type=NotifyType.INFO,
@@ -251,14 +237,14 @@ def test_plugin_mailgun_attachments(mock_post):
 
     # Do it again, but fail on the third file
     with mock.patch(
-            builtin_open_function,
+            'builtins.open',
             side_effect=(mock.Mock(), mock.Mock(), OSError())):
 
         assert obj.notify(
             body='body', title='title', notify_type=NotifyType.INFO,
             attach=attach) is False
 
-    with mock.patch(builtin_open_function) as mock_open:
+    with mock.patch('builtins.open') as mock_open:
         mock_fp = mock.Mock()
         mock_fp.seek.side_effect = OSError()
         mock_open.return_value = mock_fp