Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'python': 0.08; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'message-id:@stoneleaf.us': 0.09; 'received:gator410.hostgator.com': 0.09; 'subprocess': 0.09; 'sys,': 0.09; '~ethan~': 0.09; 'subject:file': 0.12; 'def': 0.13; '*instance*': 0.16; 'constructed': 0.16; 'myclass': 0.16; 're,': 0.16; 'received:72.11': 0.16; 'received:72.11.125': 0.16; 'received:72.11.125.166': 0.16; 'singleton': 0.16; 'subject:define': 0.16; 'subject:import': 0.16; 'wrote:': 0.18; 'instance': 0.18; 'string,': 0.18; 'header:In-Reply-To:1': 0.22; 'cc:2**0': 0.24; 'import': 0.27; 'cc:addr:gmail.com': 0.28; 'raise': 0.28; "skip:' 10": 0.29; 'print': 0.29; 'class': 0.29; 'os,': 0.30; 'subject:?': 0.31; 'point,': 0.32; 'header:User- Agent:1': 0.33; 'actually': 0.33; 'to:addr:python-list': 0.34; 'skip:# 10': 0.34; 'try:': 0.34; 'except': 0.37; 'skip:_ 10': 0.37; 'should': 0.39; 'being': 0.39; 'to:addr:python.org': 0.40; 'received:websitewelcome.com': 0.64; 'received:184': 0.67; 'ali': 0.73; 'saqib': 0.84; 'received:gateway02.websitewelcome.com': 0.93 Date: Thu, 22 Dec 2011 13:31:53 -0800 From: Ethan Furman User-Agent: Thunderbird 1.5.0.10 (Windows/20070221) MIME-Version: 1.0 To: Python Subject: Re: Can't I define a decorator in a separate file and import it? References: <53a106b8-1a2f-4b9d-9cac-d6f7dab01696@q11g2000vbq.googlegroups.com> <4EF39C16.4090803@stoneleaf.us> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator410.hostgator.com X-AntiAbuse: Original Domain - python.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - stoneleaf.us X-BWhitelist: no X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: mail.admailinc.com ([192.168.10.136]) [72.11.125.166]:2391 X-Source-Auth: ethan+stoneleaf.us X-Email-Count: 5 X-Source-Cap: dG9idWs7dG9idWs7Z2F0b3I0MTAuaG9zdGdhdG9yLmNvbQ== Cc: Saqib Ali X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 44 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1324589277 news.xs4all.nl 6901 [2001:888:2000:d::a6]:40052 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:17753 Saqib Ali wrote: > MYCLASS.PY: > > #!/usr/bin/env python > import os, sys, string, time, re, subprocess > import Singleton This should be 'from Singleton import Singleton' > @Singleton > class myClass: > > def __init__(self): > print 'Constructing myClass' At this point, the *instance* of myClass has already been constructed and it is now being initialized. The __new__ method is where the instance is actually created. > > def __del__(self): > print 'Destructing myClass' > > > class Singleton: > > def __init__(self, decorated): > self._decorated = decorated > > def Instance(self): > try: > return self._instance > except AttributeError: > self._instance = self._decorated() > return self._instance > > def __call__(self): > raise TypeError( > 'Singletons must be accessed through the `Instance` > method.') ~Ethan~