Oh, now I am definitely in favor of .[]! I read it in gmail in FireFox
which uses a small variable-pitch font whose dot is a single pixel.
The .() example was hard to find; the .[] jumped out immediately.
(When do you ever see self[anything]?)
On 2/12/07, Brett Cannon <[EMAIL PROTECTED]> wrote:
> On 2/12/07, Guido van Rossum <[EMAIL PROTECTED]> wrote:
> > FWIW, I'm strongly -1 on the "->" notation. As a C programmer it's got
> > too many neurons committed to it.
> >
> > I recommend that you do some experiments with the readability of the
> > .[...] notation, e.g. write a program that randomly generates x.[foo]
> > and x[foo], and see how fast you can spot the difference. I bet that
> > you won't have any trouble.
> >
>
> OK, so real-world examples. First, ``foo.(name)``, from urllib.py::
>
> name = 'open_' + urltype
> self.type = urltype
> name = name.replace('-', '_')
> if not hasattr(self, name):
> if proxy:
> return self.open_unknown_proxy(proxy, fullurl, data)
> else:
> return self.open_unknown(fullurl, data)
> try:
> if data is None:
> return self.(name)(url)
> else:
> return self.(name)(url, data)
> except socket.error, msg:
> raise IOError, ('socket error', msg), sys.exc_info()[2]
>
> and also::
>
> name = 'http_error_%d' % errcode
> if hasattr(self, name):
> method = self.(name)
> if data is None:
> result = method(url, fp, errcode, errmsg, headers)
> else:
> result = method(url, fp, errcode, errmsg, headers, data)
> if result: return result
> return self.http_error_default(url, fp, errcode, errmsg, headers)
>
>
> And here is urllib2.py for ``.[]`` (used different files so you
> wouldn't just remember where the change was)::
>
> if attr[:12] == '_Request__r_':
> name = attr[12:]
> if hasattr(Request, 'get_' + name):
> self.['get_' + name]()
> return self.[attr]
> raise AttributeError, attr
>
> and::
>
> handlers = chain.get(kind, ())
> for handler in handlers:
> func = handler.[meth_name]
> result = func(*args)
> if result is not None:
> return result
>
>
>
> Neither version jumps out at me strongly, although between the two the
> ``.[]`` version shows up the best. But that might also be because of
> the lower noise when used in a call.
>
> -Brett
>
--
--Guido van Rossum (home page: http://www.python.org/~guido/)
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
