Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: =?UTF-8?Q?Nagy_L=c3=a1szl=c3=b3_Zsolt?= Newsgroups: comp.lang.python Subject: Recursive type annotations Date: Wed, 8 Jun 2016 15:02:23 +0200 Lines: 26 Message-ID: References: <8e439d4f-182d-334d-ffbe-8c39856cdd33@shopzeus.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Transfer-Encoding: quoted-printable X-Trace: news.uni-berlin.de MaYJTQJJlnNBB4YIEdODHgDWass1OTOZLeumshNYOv5Q== Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'compiler': 0.05; 'method.': 0.05; 'rename': 0.07; 'annotations': 0.09; 'argument,': 0.09; 'ide': 0.09; 'nameerror:': 0.09; 'syntax': 0.13; 'def': 0.13; '"test"': 0.16; 'bind': 0.16; 'executed.': 0.16; 'expert,': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'subject:type': 0.16; 'byte': 0.18; 'prevent': 0.20; 'to:name :python-list@python.org': 0.20; 'recognize': 0.22; 'pass': 0.22; 'code.': 0.23; 'defined': 0.23; 'forgot': 0.23; 'thanks,': 0.24; '(e.g.': 0.27; "i'm": 0.30; 'class': 0.33; 'common': 0.33; 'definition': 0.34; 'but': 0.36; 'there': 0.36; 'child': 0.36; 'to:addr:python-list': 0.36; 'being': 0.37; 'method': 0.37; 'data': 0.39; 'build': 0.40; 'to:addr:python.org': 0.40; 'where': 0.40; 'some': 0.40; 'charset:iso-8859-2': 0.64; 'believe': 0.66; "'test'": 0.84; 'detecting': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shopzeus.com; s=shopzeus_com; t=1465390941; bh=IOVK3q0udjGBPz/a0l4ZLxqnbT2vKDHo8IpzGxs+nPY=; h=To:From:Subject:Date:From; b=DwY9867+kADHLw3HQc++JHxkgHHvuH1QyFVDsvDJDVhou6+NAPSrmL3GbqerJIQa+ OlPUoR5FpOE+dXXtnooxIN74R8IQvLqfhSHMdXEZueMBb+wC8m2NBxW/h4E0dLEG2Z kcng234Wi2dypY/JeqxBNkl9I+srsPlUFrRg2oBb3W6evqJZB5Q7DoqAIHTd0/a6tP dn2Gqn9trKt/zcmhUCJwzmmFis3Y1+KOFLuphDmGGx68CzRv5CmJClLr6Nad2kP9We 7vu9v7XVde9kl+ih62PSZWorIGrKWKCsq8t1gRo0sBFlvshJTXqNGxXxiN9pDQAT6K GBH9c4r6dfHOA== X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: <8e439d4f-182d-334d-ffbe-8c39856cdd33@shopzeus.com> Xref: csiph.com comp.lang.python:109675 class Test: def test(self, child : Test): pass NameError: name 'Test' is not defined I understand that the class "Test" is not defined until the class definition is executed. But it is very very common to build recursive data structures, and I have concrete use case where the IDE did not recognize the type of the argument, and as a result it forgot to rename some method calls when I auto-refactored the name of the method. I'm not an expert, but I believe that these annotations are not used by the byte compiler for anything. This is just pure syntax introduced for the person who reads the code. Is there a known obsticle that would prevent us from detecting recursive type annotations? (E.g. bind the annotation to the class that is being defined.) Thanks, Laszlo