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Groups > comp.lang.python > #89523
| From | Cecil Westerhof <Cecil@decebal.nl> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Not possible to hide local variables |
| Organization | Decebal Computing |
| References | <874mo0zoz2.fsf@Equus.decebal.nl> <mailman.57.1430207777.3680.python-list@python.org> |
| Date | 2015-04-29 08:16 +0200 |
| Message-ID | <87pp6nxxwe.fsf@Equus.decebal.nl> (permalink) |
Op Tuesday 28 Apr 2015 09:56 CEST schreef Ethan Furman: > On 04/28, Cecil Westerhof wrote: >> If I remember correctly you can not hide variables of a class or >> make them read-only? >> >> I want to rewrite my moving average to python. The init is: >> def __init__(self, length): >> if type(length) != int: >> raise ParameterError, 'Parameter has to be an int' >> if n < 0: >> raise ValueError, 'Parameter should be greater or equal 2' >> self.length = length >> self.old_values = [] >> self.current_total = 0 >> >> But when someone changes length, old_values, or current_total that >> would wreck havoc with my class instance. What is the best way to >> handle this? > > Prefix those names with a single leading underscore, which is the > convention for private variables. Done. > This way, if some user (maybe you! ;) has a good reason to change > those values in can be done, but it is quite clear that said user is > mucking about with internals and they are on their own. There is something to say for this way of working. -- Cecil Westerhof Senior Software Engineer LinkedIn: http://www.linkedin.com/in/cecilwesterhof
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Not possible to hide local variables Cecil Westerhof <Cecil@decebal.nl> - 2015-04-28 09:33 +0200
Re: Not possible to hide local variables Ethan Furman <ethan@stoneleaf.us> - 2015-04-28 00:56 -0700
Re: Not possible to hide local variables Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 08:16 +0200
Re: Not possible to hide local variables Michael Torrie <torriem@gmail.com> - 2015-04-29 21:10 -0600
Re: Not possible to hide local variables Chris Angelico <rosuav@gmail.com> - 2015-04-28 18:06 +1000
Re: Not possible to hide local variables Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 08:25 +0200
Re: Not possible to hide local variables Chris Angelico <rosuav@gmail.com> - 2015-04-29 17:36 +1000
Re: Not possible to hide local variables Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-28 18:37 +1000
Re: Not possible to hide local variables Chris Angelico <rosuav@gmail.com> - 2015-04-28 18:44 +1000
Re: Not possible to hide local variables Marko Rauhamaa <marko@pacujo.net> - 2015-04-28 12:20 +0300
Re: Not possible to hide local variables Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 08:32 +0200
Re: Not possible to hide local variables Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-30 14:05 +1000
Re: Not possible to hide local variables Marko Rauhamaa <marko@pacujo.net> - 2015-04-30 08:10 +0300
Re: Not possible to hide local variables Chris Angelico <rosuav@gmail.com> - 2015-04-30 16:01 +1000
Re: Not possible to hide local variables Cecil Westerhof <Cecil@decebal.nl> - 2015-04-29 08:14 +0200
Re: Not possible to hide local variables Grant Edwards <invalid@invalid.invalid> - 2015-04-29 14:16 +0000
Re: Not possible to hide local variables Dave Angel <davea@davea.name> - 2015-04-29 22:31 -0400
Re: Not possible to hide local variables Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-04-30 08:53 -0400
Re: Not possible to hide local variables Cecil Westerhof <Cecil@decebal.nl> - 2015-04-30 16:50 +0200
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