Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.mixmin.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!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 0.030 X-Spam-Evidence: '*H*': 0.94; '*S*': 0.00; 'say,': 0.05; "'python": 0.09; 'mail:': 0.09; 'namespace': 0.09; '"getting': 0.16; '"python': 0.16; 'b=2)': 0.16; 'does,': 0.16; 'least)': 0.16; 'reedy': 0.16; 'subject:object': 0.16; 'subject:simple': 0.16; 'subject:type': 0.16; 'write,': 0.16; '{})': 0.16; ':-)': 0.16; 'module': 0.19; '>>>': 0.22; 'import': 0.22; 'to:name:python- list@python.org': 0.22; 'right.': 0.26; 'asking': 0.27; 'header :In-Reply-To:1': 0.27; 'correct': 0.29; '>>>>': 0.31; 'obscure': 0.31; 'class': 0.32; '-----': 0.33; 'header:Received:9': 0.33; 'common': 0.35; 'but': 0.35; 'useful': 0.36; 'should': 0.36; 'employee': 0.37; 'too': 0.37; 'to:addr:python-list': 0.38; 'previous': 0.38; 'little': 0.38; 'does': 0.39; 'subject:': 0.39; 'subject:" ': 0.39; 'to:addr:python.org': 0.39; 'received:98.137': 0.60; 'august': 0.61; 'new': 0.61; 'simple': 0.61; 're:': 0.63; 'skip:n 10': 0.64; 'to:2**2': 0.65; 'details': 0.65; 'here': 0.66; 'header:Reply-To:1': 0.67; 'email addr:python.org"': 0.68; 'car': 0.72; 'to:addr:yahoo.com': 0.81; 'received:98.138.229': 0.84 X-Yahoo-Newman-Property: ymail-4 X-Yahoo-Newman-Id: 949685.79880.bm@omp1033.mail.gq1.yahoo.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1407064452; bh=2ZmhjAA9Wd11iOkXc0nYFmVRfwOJRTEUexOJNKrCxWo=; h=References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=oGcphvDrFXwzgJ782dcj1ZDzbx//uvEr+8CJ40F3cdKX3EHAlaD/qwqhY6FsVsxBZMkOzNpPHWF3xAcMa6UAR3Zuaio7UWadSm4tOrD3zDx1TJCvIor6ZH5xTOTq07HtmpwUL4rbV3uzGSfmvzrKVJQcjoib7rK0NdEafv0kpBY= X-YMail-OSG: n.JPiukVM1lsYaGaeokkFajb3UQYYGv3TB87U2C.P6cUky0 kSn_glhHCAPTR2U3u4XRoE2IXpdfstlEce9MjITSRk.Sckxw8IYjfXucwiMv nImiWujWKKGwc80IKDwG_uHRHo0hur9m0D3Fpfx_j_byh7gtCPMF3GhmvDs. NxjQKLtcREbfo9Q.JEvr6MTrqMuS7JvjRAVPoY9AK.ehYXxyMKTzYHgdFkru BFxBtqwbGK8WKkwTUG0ON6cZluGO7zy9fiZwziQRDVo1wEIVc.GvcB6Dpkmc mpa5PVxCP_Th6XbmgxRGoWWjJcpcT3nR0qYyceKELM7zxUzOqA8m2KEnGtt7 lFFRdb9PGf5lcHXcwR8TGn5aQeVLigpXm2SnbYlVYfkWAnUBhCi8lz737ZQz OYUZxyEcbJ1oozlUj6Uj0xQc_ZdE.C43zIH_DPaD8DLIKf4gATw1ATl3d.Y3 avzQKAJe2GHMMIS6FkYkFP88hMIl_YS95Q3.2gNY22_ko1C.ljygCjxRKgXZ C7QwIfbvMsEuj5rBY3ruDMQjIVXSXWjlEw.dVIVhB92dqmLX_K9Y2o.rXDSZ C9hxK3C467mzzg4mPuY1VcKMTWQxX7u1iLbVrvavKsKbMJEdP.RbPcm5_2g- - X-Rocket-MIMEInfo: 002.001, CgotLS0tLSBPcmlnaW5hbCBNZXNzYWdlIC0tLS0tCgo.IEZyb206IEFsYmVydC1KYW4gUm9za2FtIDxmb21jbEB5YWhvby5jb20uZG1hcmMuaW52YWxpZD4KPiBUbzogVGVycnkgUmVlZHkgPHRqcmVlZHlAdWRlbC5lZHU.OyAicHl0aG9uLWxpc3RAcHl0aG9uLm9yZyIgPHB5dGhvbi1saXN0QHB5dGhvbi5vcmc.Cj4gQ2M6IAo.IFNlbnQ6IFN1bmRheSwgQXVndXN0IDMsIDIwMTQgMTE6MTcgQU0KPiBTdWJqZWN0OiBSZTogQ29ycmVjdCB0eXBlIGZvciBhIHNpbXBsZSAiYmFnIG9mIGF0dHJpYnV0ZXMiIG5hbWUBMAEBAQE- X-Mailer: YahooMailWebService/0.8.198.689 References: <7ef67ccc-3fc3-47dd-b858-09ef3b57a497@googlegroups.com> <87r40zmkhr.fsf@elektro.pacujo.net> <53dd0717$0$29973$c3e8da3$5496439d@news.astraweb.com> <70e5f2f1-661f-40f2-bb7a-76e569c4d092@googlegroups.com> <1407057464.64980.YahooMailNeo@web163806.mail.gq1.yahoo.com> Date: Sun, 3 Aug 2014 04:14:12 -0700 From: Albert-Jan Roskam Subject: Re: Correct type for a simple "bag of attributes" namespace object To: Albert-Jan Roskam , Terry Reedy , "python-list@python.org" In-Reply-To: <1407057464.64980.YahooMailNeo@web163806.mail.gq1.yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Albert-Jan Roskam 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: 26 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1407064631 news.xs4all.nl 2970 [2001:888:2000:d::a6]:35408 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:75589 =0A=0A----- Original Message -----=0A=0A> From: Albert-Jan Roskam =0A> To: Terry Reedy ; "python-list= @python.org" =0A> Cc: =0A> Sent: Sunday, August 3, = 2014 11:17 AM=0A> Subject: Re: Correct type for a simple "bag of attributes= " namespace object=0A=0A=0A=0A>>>>> =A0 Right. The 'types' module pro= vides a SimpleNamespace =0A> class =0A>> for the=0A>>>>> =A0 common "bag o= f attributes" use case::=0A>>>>> =0A>>>>> =A0 =A0 =A0 >>> import types=0A>= >>>> =A0 =A0 =A0 >>> foo =3D types.SimpleNamespace()=0A>>>>> =A0 =A0 =A0 = >>> foo.x =3D 3=0A>>>>> =A0 =A0 =A0 >>> foo=0A>>>>> =A0 =A0 =A0 namespace= (x=3D3)=0A>>>> =0A>>>> =A0 This is too much for children (& beginners).=0A>= >>> =0A>>>> =A0 But perhaps what I should be asking for is for a new built-= in that =0A> does =0A>> what types.SimpleNamespace() does, so that without= any import you can =0A> write, =0A>> say,=0A>>>> =0A>>>> =A0 foo =3D name= space(a=3D1, b=3D2)=0A>>>> =A0 # or=0A>>>> =A0 bar =3D namespace()=0A>>>> = =A0 bar.a =3D 1=0A> =0A> I find the following obscure (to me at least) use = of type() useful exactly for =0A> this "bag of attributes" use case:=0A>>>>= employee =3D type("Employee", (object,), {})=0A>>>> employee.name =3D "J= ohn Doe"=0A>>>> employee.position =3D "Python programmer"=0A>>>> employee= .name, employee.position, employee=0A> ('John Doe', 'Python programmer', '__main__.Employee'>)=0A> =0A>>>> details =3D dict(name=3D"John = Doe", position=3D"Python =0A> programmer")=0A>>>> employee =3D type("Emplo= yee", (object,), details)=0A>>>> employee.name, employee.position, employe= e=0A> ('John Doe', 'Python programmer', '__main__.Employee'>)= =0A=0A=0APS to my previous mail: class() can (should?) be used here to do t= he exact same thing but it feels a little like "Getting your car [OOP] just= because you need an ashtray [bundled items]". :-)