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python-cheatsheet
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Exceptions

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Jure Šorn 2 years ago
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  1. 10
      README.md
  2. 14
      index.html

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README.md
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@ -1371,7 +1371,6 @@ LogicOp = Enum('LogicOp', {'AND': partial(lambda l, r: l and r),
Exceptions Exceptions
---------- ----------
### Basic Example
```python ```python
try: try:
<code> <code>
@ -1397,14 +1396,15 @@ finally:
### Catching Exceptions ### Catching Exceptions
```python ```python
except <exception>:
except <exception> as <name>:
except (<exception>, [...]):
except (<exception>, [...]) as <name>:
except <exception>: ...
except <exception> as <name>: ...
except (<exception>, [...]): ...
except (<exception>, [...]) as <name>: ...
``` ```
* **Also catches subclasses of the exception.** * **Also catches subclasses of the exception.**
* **Use `'traceback.print_exc()'` to print the error message to stderr.** * **Use `'traceback.print_exc()'` to print the error message to stderr.**
* **Use `'print(<name>)'` to print just the cause of the exception (its arguments).** * **Use `'print(<name>)'` to print just the cause of the exception (its arguments).**
* **Use `'logging.exception(<message>)'` to log the exception.**
### Raising Exceptions ### Raising Exceptions
```python ```python

14
index.html
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@ -1176,12 +1176,11 @@ LogicOp = Enum(<span class="hljs-string">'LogicOp'</span>, {<span class="hljs-st
<ul> <ul>
<li><strong>Member names are in all caps because trying to access a member that is named after a reserved keyword raises SyntaxError.</strong></li> <li><strong>Member names are in all caps because trying to access a member that is named after a reserved keyword raises SyntaxError.</strong></li>
</ul> </ul>
<div><h2 id="exceptions"><a href="#exceptions" name="exceptions">#</a>Exceptions</h2><div><h3 id="basicexample">Basic Example</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">try</span>:
<div><h2 id="exceptions"><a href="#exceptions" name="exceptions">#</a>Exceptions</h2><pre><code class="python language-python hljs"><span class="hljs-keyword">try</span>:
&lt;code&gt; &lt;code&gt;
<span class="hljs-keyword">except</span> &lt;exception&gt;: <span class="hljs-keyword">except</span> &lt;exception&gt;:
&lt;code&gt; &lt;code&gt;
</code></pre></div></div>
</code></pre></div>
<div><h3 id="complexexample">Complex Example</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">try</span>: <div><h3 id="complexexample">Complex Example</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">try</span>:
&lt;code_1&gt; &lt;code_1&gt;
@ -1199,16 +1198,17 @@ LogicOp = Enum(<span class="hljs-string">'LogicOp'</span>, {<span class="hljs-st
<li><strong>Code inside the <code class="python hljs"><span class="hljs-string">'else'</span></code> block will only be executed if <code class="python hljs"><span class="hljs-string">'try'</span></code> block had no exceptions.</strong></li> <li><strong>Code inside the <code class="python hljs"><span class="hljs-string">'else'</span></code> block will only be executed if <code class="python hljs"><span class="hljs-string">'try'</span></code> block had no exceptions.</strong></li>
<li><strong>Code inside the <code class="python hljs"><span class="hljs-string">'finally'</span></code> block will always be executed (unless a signal is received).</strong></li> <li><strong>Code inside the <code class="python hljs"><span class="hljs-string">'finally'</span></code> block will always be executed (unless a signal is received).</strong></li>
</ul> </ul>
<div><h3 id="catchingexceptions">Catching Exceptions</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">except</span> &lt;exception&gt;:
<span class="hljs-keyword">except</span> &lt;exception&gt; <span class="hljs-keyword">as</span> &lt;name&gt;:
<span class="hljs-keyword">except</span> (&lt;exception&gt;, [...]):
<span class="hljs-keyword">except</span> (&lt;exception&gt;, [...]) <span class="hljs-keyword">as</span> &lt;name&gt;:
<div><h3 id="catchingexceptions">Catching Exceptions</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">except</span> &lt;exception&gt;: ...
<span class="hljs-keyword">except</span> &lt;exception&gt; <span class="hljs-keyword">as</span> &lt;name&gt;: ...
<span class="hljs-keyword">except</span> (&lt;exception&gt;, [...]): ...
<span class="hljs-keyword">except</span> (&lt;exception&gt;, [...]) <span class="hljs-keyword">as</span> &lt;name&gt;: ...
</code></pre></div> </code></pre></div>
<ul> <ul>
<li><strong>Also catches subclasses of the exception.</strong></li> <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">'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;)'</span></code> to print just the cause of the exception (its arguments).</strong></li> <li><strong>Use <code class="python hljs"><span class="hljs-string">'print(&lt;name&gt;)'</span></code> to print just the cause of the exception (its arguments).</strong></li>
<li><strong>Use <code class="python hljs"><span class="hljs-string">'logging.exception(&lt;message&gt;)'</span></code> to log the exception.</strong></li>
</ul> </ul>
<div><h3 id="raisingexceptions">Raising Exceptions</h3><pre><code class="python language-python hljs"><span class="hljs-keyword">raise</span> &lt;exception&gt; <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;() <span class="hljs-keyword">raise</span> &lt;exception&gt;()

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