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+Date: Wed, 23 Mar 2016 09:42:49 -0700\r
+From: "W. Trevor King" <wking@tremily.us>\r
+To: David Bremner <david@tethera.net>\r
+Cc: notmuch@notmuchmail.org\r
+Subject: Re: [PATCH v2 2/4] nmbug-status: Add meta.message-url config setting\r
+Message-ID: <20160323164249.GX10674@odin.tremily.us>\r
+References: <cover.1451683912.git.wking@tremily.us>\r
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+\r
+On Wed, Mar 23, 2016 at 08:19:34AM -0300, David Bremner wrote:\r
+> W. Trevor King writes:\r
+> > from __future__ import print_function\r
+> > @@ -232,6 +232,10 @@ class Page (object):\r
+> > class HtmlPage (Page):\r
+> > _slug_regexp =3D re.compile('\W+')\r
+> >\r
+> > + def __init__(self, message_url_template, **kwargs):\r
+> > + self.message_url_template =3D message_url_template\r
+> > + super(HtmlPage, self).__init__(**kwargs)\r
+> > +\r
+>\r
+> > @@ -395,6 +400,8 @@ _PAGES['text'] =3D Page()\r
+> > _PAGES['html'] =3D HtmlPage(\r
+> > header=3Dheader_template.format(**context),\r
+> > footer=3Dfooter_template.format(**context),\r
+> > + message_url_template=3Dconfig['meta'].get(\r
+> > + 'message-url', 'http://mid.gmane.org/{message-id}'),\r
+> > )\r
+> >\r
+>\r
+> Maybe I'm missing some python knowledged, but it looks the\r
+> constructor is defined to take a regular argument for\r
+> message_url_template, but only passed in as a keyword. Does this\r
+> really work?\r
+\r
+Yup. From [1]:\r
+\r
+ positional-only: specifies an argument that can be supplied only by\r
+ position. Python has no syntax for defining positional-only\r
+ parameters. However, some built-in functions have positional-only\r
+ parameters (e.g. abs()).\r
+\r
+I can't find a similar Python 3 glossary, but see [2]. Whether we use:\r
+\r
+ def __init__(self, message_url_template, **kwargs):\r
+ =E2=80=A6\r
+\r
+or:\r
+\r
+ def __init__(self, message_url_template=3D'foobar', **kwargs):\r
+ =E2=80=A6\r
+\r
+just controls whether the message_url_template has a default or not,\r
+and not whether it can be set via positional or keyword arguments.\r
+\r
+There is Python syntax for keyword-only arguments, and it would look\r
+like [2]:\r
+\r
+ def __init__(self, *, message_url_template, **kwargs):\r
+ =E2=80=A6\r
+\r
+or:\r
+\r
+ def __init__(self, *, message_url_template=3D'foobar', **kwargs):\r
+ =E2=80=A6\r
+\r
+in the former case, you'd have to call __init__ with a\r
+message_url_template=3D=E2=80=A6 keyword argument or you'd get:\r
+\r
+ TypeError: __init__() missing 1 required keyword-only argument: 'message_=\r
+url_template'\r
+\r
+With the latter case, calling __init__ without a message_url_template\r
+argument would just get you the default value (=E2=80=98foobar=E2=80=99 in =\r
+these\r
+examples).\r
+\r
+Cheers,\r
+Trevor\r
+\r
+[1]: https://docs.python.org/2/glossary.html#term-parameter\r
+[2]: https://docs.python.org/3/reference/compound_stmts.html#function-defin=\r
+itions\r
+\r
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projects / notmuch-archives.git / commitdiff