Comments on: Trapping CTRL+C in Python http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/ Ugh, Stacy's talking again... Mon, 30 Aug 2010 20:38:03 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Yuki http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-149 Yuki Wed, 11 Aug 2010 17:43:13 +0000 http://stacyprowell.com/blog/?p=123#comment-149 Hi. This is exactly what I need. I implemented everything like you said but when I run it, it is as if there's a flag implemented even before I can implement the ctrl-c. Thus my loop only goes through 1 cycle. Where does do_cleanup come from and is it necessary? Hi.

This is exactly what I need. I implemented everything like you said but when I run it, it is as if there’s a flag implemented even before I can implement the ctrl-c. Thus my loop only goes through 1 cycle.

Where does do_cleanup come from and is it necessary?

]]> By: Sergio Philbin http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-141 Sergio Philbin Mon, 14 Jun 2010 05:34:04 +0000 http://stacyprowell.com/blog/?p=123#comment-141 Fantastic post, I will save this post in my Del.icio.us account. Have a great evening. Fantastic post, I will save this post in my Del.icio.us account. Have a great evening.

]]> By: demikaze http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-119 demikaze Wed, 12 May 2010 11:49:56 +0000 http://stacyprowell.com/blog/?p=123#comment-119 ctrl-c generates KeyboardInterrupt exception... ;) ctrl-c generates KeyboardInterrupt exception… ;)

]]> By: stacy http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-12 stacy Thu, 16 Apr 2009 02:22:13 +0000 http://stacyprowell.com/blog/?p=123#comment-12 The single underscore signals that something is private "by convention." That is, you can still access the item, but the underscore signals that you shouldn't. From PEP 8 (http://www.python.org/dev/peps/pep-0008/): _single_leading_underscore: weak "internal use" indicator. E.g. "from M import *" does not import objects whose name starts with an underscore. The @property basically makes a read-only attribute. That is, I can write: bh = BreakHandler() ... print bh.trapped print bh.count But I cannot set them with bh.trapped = True. The @property is a decorator providing a shorthand for the python property() built in to declare a read-only property. Python decorators are pretty nifty. They are described in PEP 318 (http://www.python.org/dev/peps/pep-0318/). See http://www.python.org/doc/2.6/library/functions.html and search for @property. The single underscore signals that something is private “by convention.” That is, you can still access the item, but the underscore signals that you shouldn’t.

From PEP 8 (http://www.python.org/dev/peps/pep-0008/):

_single_leading_underscore: weak “internal use” indicator. E.g. “from M import *” does not import objects whose name starts with an underscore.

The @property basically makes a read-only attribute. That is, I can write:

bh = BreakHandler()
…
print bh.trapped
print bh.count

But I cannot set them with bh.trapped = True.

The @property is a decorator providing a shorthand for the python property() built in to declare a read-only property. Python decorators are pretty nifty. They are described in PEP 318 (http://www.python.org/dev/peps/pep-0318/).

See http://www.python.org/doc/2.6/library/functions.html and search for @property.

]]> By: aonlazio http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-11 aonlazio Wed, 15 Apr 2009 18:26:33 +0000 http://stacyprowell.com/blog/?p=123#comment-11 Superb, this is exactly what I want and I bet most people in network programming realm want too. By the way I have a couple of questions (1) Why do u use "_" in front of some properties such as self._count, self._enabled, self._emphatic ? Does it have special meanings? (2) What does @property do? Thank you very much. Aonlazio Superb, this is exactly what I want and I bet most people in network programming realm want too.
By the way I have a couple of questions
(1) Why do u use “_” in front of some properties such as self._count, self._enabled, self._emphatic ? Does it have special meanings?

(2) What does @property do?

Thank you very much.

Aonlazio

]]> By: stacy http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-5 stacy Tue, 31 Mar 2009 20:30:17 +0000 http://stacyprowell.com/blog/?p=123#comment-5 That's easy to do. There's not much code; feel free to make the change! You could also modify the code to allow trapping other signals. I think on Windows the Break key generates a different signal than CTRL+C. That’s easy to do. There’s not much code; feel free to make the change! You could also modify the code to allow trapping other signals. I think on Windows the Break key generates a different signal than CTRL+C.

]]> By: Brendan http://stacyprowell.com/blog/2009/03/30/trapping-ctrlc-in-python/comment-page-1/#comment-4 Brendan Tue, 31 Mar 2009 20:27:45 +0000 http://stacyprowell.com/blog/?p=123#comment-4 You should add a thing to let you specify a callback when the user hits ctrl-c. As long as the callback returns, there's no difference. You should add a thing to let you specify a callback when the user hits ctrl-c. As long as the callback returns, there’s no difference.

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