add logging.py

Author: junhuanchen

13.system/logging.py

@@ -0,0 +1,17 @@
+
+def logging(func):
+    import sys
+    def _deco():
+        try:
+            func()
+        except Exception as e:
+            with open("run.log", "a") as f:
+                sys.print_exception(e, f)
+    return _deco
+
+@logging
+def bar():
+    print('this is test output run.log')
+    c = e
+
+bar()