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Mark Pilgrim
2009-08-14 23:14:33 -04:00
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@@ -264,7 +264,7 @@ SyntaxError: non-keyword arg after keyword arg</samp></pre>
<p><span class=u>&#x261E;</span>Unlike Java, Python functions don&#8217;t declare which exceptions they might raise. It&#8217;s up to you to determine what possible exceptions you need to catch.
</blockquote>
<p>An exception doesn&#8217;t need result in a complete program crash, though. Exceptions can be <em>handled</em>. Sometimes an exception is really because you have a bug in your code (like accessing a variable that doesn&#8217;t exist), but sometimes an exception is something you can anticipate. If you&#8217;re opening a file, it might not exist. If you&#8217;re importing a module, it might not be installed. If you&#8217;re connecting to a database, it might be unavailable, or you might not have the correct security credentials to access it. If you know a line of code may raise an exception, you should handle the exception using a <code>try...except</code> block.
<p>An exception doesn&#8217;t need to result in a complete program crash, though. Exceptions can be <em>handled</em>. Sometimes an exception is really because you have a bug in your code (like accessing a variable that doesn&#8217;t exist), but sometimes an exception is something you can anticipate. If you&#8217;re opening a file, it might not exist. If you&#8217;re importing a module, it might not be installed. If you&#8217;re connecting to a database, it might be unavailable, or you might not have the correct security credentials to access it. If you know a line of code may raise an exception, you should handle the exception using a <code>try...except</code> block.
<blockquote class='note compare java'>
<p><span class=u>&#x261E;</span>Python uses <code>try...except</code> blocks to handle exceptions, and the <code>raise</code> statement to generate them. Java and <abbr>C++</abbr> use <code>try...catch</code> blocks to handle exceptions, and the <code>throw</code> statement to generate them.