Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #104939
| Path | csiph.com!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail |
|---|---|
| From | Jon Ribbens <jon+usenet@unequivocal.co.uk> |
| Newsgroups | comp.lang.python |
| Subject | Re: Seekable files |
| Date | Tue, 15 Mar 2016 13:49:44 -0000 (UTC) |
| Organization | A noiseless patient Spider |
| Lines | 39 |
| Message-ID | <slrnneg4tk.19u.jon+usenet@wintry.unequivocal.co.uk> (permalink) |
| References | <56e7e57a$0$1589$c3e8da3$5496439d@news.astraweb.com> <slrnnefqbq.19u.jon+usenet@wintry.unequivocal.co.uk> <87a8m0dm96.fsf@elektro.pacujo.net> |
| Injection-Date | Tue, 15 Mar 2016 13:49:44 -0000 (UTC) |
| Injection-Info | mx02.eternal-september.org; posting-host="ba273c0c5d7577399b57ba7b03035ea2"; logging-data="30928"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/rIjXpF5j07S1yyPZ+RXGPILMlTVEGY/I=" |
| User-Agent | slrn/1.0.2 (Linux) |
| Cancel-Lock | sha1:20lWnk3T0k+admDiNdYQUKFI+XM= |
| Xref | csiph.com comp.lang.python:104939 |
Show key headers only | View raw
On 2016-03-15, Marko Rauhamaa <marko@pacujo.net> wrote:
> Jon Ribbens <jon+usenet@unequivocal.co.uk>:
>> I'd just do something like:
>>
>> try:
>> fileobj.seek(where-i-want-to-seek-to)
>> except (AttributeError, EnvironmentError):
>> # file is not seekable
>
> Unlike Java, Python does not declare syntactically which exceptions the
> caller should expect. Unfortunately, the library documentation is not
> clear on it, either. So it is often a bit difficult to write proper
> try-except logic around a function.
This is true, although I'm not sure why you are mentioning it here
since I'm fairly sure the above code suggestion is reasonably correct
and the documentation is pretty clear.
> Having to specify the possible exceptions in Java is very painful and
> has complicated the introduction of closures to Java quite a bit.
It is one of the extremely serious design errors in Java, I think.
> I think it points to a big practical problem in the whole exception
> paradigm.
Well, no. That one individual language screwed up its implementation
of exceptions does not mean the whole concept of exceptions is broken.
> Makes you wonder if the old error code mechanism would have
> been better, after all. ("Why does Go not have exceptions?" <URL:
> https://golang.org/doc/faq>.)
I think they are wrong, and indeed their argument seems to be a
ludicrous one based upon a misunderstanding of the English meaning of
the word "exception"!
Any high-level language that does not include exceptions is not fit
for purpose, in my opinion.
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Seekable files Steven D'Aprano <steve@pearwood.info> - 2016-03-15 21:35 +1100
Re: Seekable files Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-15 10:49 +0000
Re: Seekable files Marko Rauhamaa <marko@pacujo.net> - 2016-03-15 13:16 +0200
Re: Seekable files Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-15 13:49 +0000
Re: Seekable files Marko Rauhamaa <marko@pacujo.net> - 2016-03-15 16:26 +0200
Re: Seekable files Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2016-03-15 14:25 +0000
csiph-web