Exceptions

gto76 · gto76 · commit daaa45b3ab72 · 2020-10-21T18:27:52.000+02:00
diff --git a/README.md b/README.md
@@ -1374,6 +1374,7 @@ except (<exception>, [...]) as <name>:
 ```
 * **Also catches subclasses of the exception.**
 * **Use `'traceback.print_exc()'` to print the error message to stderr.**
+* **Use `'print(<name>, file=sys.stderr)'` to print just the cause of the exception.**
 
 ### Raising Exceptions
 ```python
@@ -1396,7 +1397,7 @@ exc_type  = <name>.__class__
 filename  = <name>.__traceback__.tb_frame.f_code.co_filename
 func_name = <name>.__traceback__.tb_frame.f_code.co_name
 line      = linecache.getline(filename, <name>.__traceback__.tb_lineno)
-error_msg = traceback.format_exception(exc_type, <name>, <name>.__traceback__)
+error_msg = ''.join(traceback.format_exception(exc_type, <name>, <name>.__traceback__))
 ```
 
 ### Built-in Exceptions
diff --git a/index.html b/index.html
@@ -1311,6 +1311,7 @@
 <ul>
 <li><strong>Also catches subclasses of the exception.</strong></li>
 <li><strong>Use <code class="python hljs"><span class="hljs-string">'traceback.print_exc()'</span></code> to print the error message to stderr.</strong></li>
+<li><strong>Use <code class="python hljs"><span class="hljs-string">'print(&lt;name&gt;, file=sys.stderr)'</span></code> to print just the cause of the exception.</strong></li>
 </ul>
 <div><h3 id="raisingexceptions">Raising Exceptions</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">raise</span> &lt;exception&gt;
 <span class="hljs-keyword">raise</span> &lt;exception&gt;()
@@ -1327,7 +1328,7 @@
 filename  = &lt;name&gt;.__traceback__.tb_frame.f_code.co_filename
 func_name = &lt;name&gt;.__traceback__.tb_frame.f_code.co_name
 line      = linecache.getline(filename, &lt;name&gt;.__traceback__.tb_lineno)
-error_msg = traceback.format_exception(exc_type, &lt;name&gt;, &lt;name&gt;.__traceback__)
+error_msg = <span class="hljs-string">''</span>.join(traceback.format_exception(exc_type, &lt;name&gt;, &lt;name&gt;.__traceback__))
 </code></pre></div>
 
 <div><h3 id="builtinexceptions">Built-in Exceptions</h3><pre><code class="text language-text">BaseException
