Update exceptions.rst (yasoob#183)

jpastuszuk · yasoob · commit 49d685b0b263 · 2018-11-30T11:06:02.000-05:00
It is always better to catch exception and raise it with a detailed information, difference between just raising and raising caught exception.

With rising e:
.. code:: python
    Traceback (most recent call last):
        File "&lt;stdin&gt;", line 5, in &lt;module&gt;
        File "&lt;stdin&gt;", line 2, in &lt;module&gt;
     FileNotFoundError: [Errno 2] No such file or directory: 'test'

Just rising:
.. code:: python
    Traceback (most recent call last):
       File "&lt;stdin&gt;", line 2, in &lt;module&gt;
    FileNotFoundError: [Errno 2] No such file or directory: 'test'
diff --git a/exceptions.rst b/exceptions.rst
@@ -56,9 +56,9 @@ trapping ALL exceptions:
 
     try:
         file = open('test.txt', 'rb')
-    except Exception:
+    except Exception as e:
         # Some logging if you want
-        raise
+        raise e
 
 This can be helpful when you have no idea about the exceptions which may
 be thrown by your program.
