Path: csiph.com!usenet.pasdenom.info!gegeweb.org!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed2a.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 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'lookup': 0.09; 'message-id:@stoneleaf.us': 0.09; 'subject:skip:c 10': 0.09; '~ethan~': 0.09; 'comp': 0.16; 'filename:fname piece:signature': 0.16; 'loop.': 0.16; 'namespace,': 0.16; 'namespace;': 0.16; 'skips': 0.16; 'subject:class': 0.16; 'subject:fails': 0.16; 'unnamed': 0.16; 'workaround:': 0.16; 'wrote:': 0.18; 'header:User-Agent:1': 0.23; 'header:In-Reply- To:1': 0.27; 'subject:list': 0.30; 'class': 0.32; 'actual': 0.34; 'charset:us-ascii': 0.36; 'list': 0.37; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'to:addr:python.org': 0.39; 'john': 0.61; 'received:173': 0.61; 'making': 0.63; 'name': 0.63; 'effectively': 0.66 Date: Mon, 12 Jan 2015 12:40:13 -0800 From: Ethan Furman User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: python-list@python.org Subject: Re: Namespace puzzle, list comprehension fails within class definition References: In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="GVptfGemR09nr9IApsRHkfkIjUcTfv2Tm" X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 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: 48 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1421095249 news.xs4all.nl 2953 [2001:888:2000:d::a6]:55029 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:83629 This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --GVptfGemR09nr9IApsRHkfkIjUcTfv2Tm Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable On 01/12/2015 12:25 PM, John Ladasky wrote: > d =3D {0:"a", 1:"b", 2:"c", 3:"d"} > e =3D [d[x] for x in (0,2)] >=20 > class Foo: > f =3D {0:"a", 1:"b", 2:"c", 3:"d"} > print(f) > g =3D [f[x] for x in (0,2)] In Foo 'f' is part of an unnamed namespace; the list comp 'g' has its own= namespace, effectively making be a nonlocal; class name lookup skips nonlocal namespaces. Workaround: use an actual for loop. -- ~Ethan~ --GVptfGemR09nr9IApsRHkfkIjUcTfv2Tm Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAEBAgAGBQJUtDEvAAoJENZ7D1rrH75NeVsQAIPAcRbyYKrRq/IsxChvM2RH bXidPv/POrHEvZO9PH9VnRNhKfQUppMPRa+zZ7XHIVeHlIhbAKHIA6EcHkEy3Cmo FNHC+HjuLoXMuHAOxXkv64u5W0VQLLQQLWMkw3iDUox2scLv0nrvhDM/xUNrlo+Q m0dC1BTel6HtFGjLBv6Wc76mpTpQjvfyT7rsEFxM3/uBTqZ8iy263wVtUzY3gRFV +uT5+NcVr+0DeWT6egj+VsGIG7AtyHGFYLGnaPaiL+idahacVOJkcxP0HQkMOXc+ CObhbI3fW8UEeTrW5cjiCuWNfrdLBhAACJYWGmGFSCJFpuqLorhYwrgDuV0XzTSC xCNpabEpBXKS+CxIMtHNfmtXq6FHRYJyL9sJJhrHNA6rDfwyJSRmTVeLkTH55K0V 2K5ctXB1sVF9QpV0eYFtgMyf1IkrDmdDJ3rvMXH340nj5P+63orpzdCwcU6cdUkY lyx58QRfuh+/q3a5mMOFPESy1/G+iPG88TDVvCLUusalUEU8ukfvkeDmae/GqGAa nEawjaRmh7DMGcXRjFZhGjOwFkS5Y8PmlDUIoRwqowhXm5X3KArnKxjREpbN91Uk Uw1J2jc06QlEr6R/zeuc4gzfFOxnmIte+3bnMvRZK/1HGFg3XNNpnHsTr1rZHWS8 rNcg+c4AF9D8mtYByqkx =SO4D -----END PGP SIGNATURE----- --GVptfGemR09nr9IApsRHkfkIjUcTfv2Tm--