Managing thirdparty package: defer.

thirdparty/defer/sugar/__init__.py

@@ -0,0 +1,13 @@
+import sys
+
+from defer.defer import Defer
+from defer.sugar._parse import _ParseDefer
+
+
+def install():
+    if not isinstance(sys.gettrace(), _ParseDefer):
+        sys.settrace(_ParseDefer(sys.gettrace()))
+
+
+defer = Defer()
+install()