Fixed callable name detection for methods in old style classes

2 files changed, 8 insertions, 1 deletions

diff --git a/apscheduler/util.py b/apscheduler/util.py
index 88254ff..3c48e55 100644
--- a/apscheduler/util.py
+++ b/apscheduler/util.py
@@ -5,6 +5,7 @@ from __future__ import division
 from datetime import date, datetime, time, timedelta, tzinfo
 from calendar import timegm
 from functools import partial
+from inspect import isclass
 import re
 
 from pytz import timezone, utc, FixedOffset
@@ -224,7 +225,7 @@ def get_callable_name(func):
     # class methods, bound and unbound methods
     f_self = getattr(func, '__self__', None) or getattr(func, 'im_self', None)
     if f_self and hasattr(func, '__name__'):
-        f_class = f_self if isinstance(f_self, type) else f_self.__class__
+        f_class = f_self if isclass(f_self) else f_self.__class__
     else:
         f_class = getattr(func, 'im_class', None)
 
diff --git a/docs/versionhistory.rst b/docs/versionhistory.rst
index 32b5843..fba72a8 100644
--- a/docs/versionhistory.rst
+++ b/docs/versionhistory.rst
@@ -4,6 +4,12 @@ Version history
 To find out how to migrate your application from a previous version of
 APScheduler, see the :doc:`migration section <migration>`.
 
+3.5.3
+-----
+
+* Fixed callable name detection for methods in old style classes
+
+
 3.5.2
 -----