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Groups > comp.lang.python > #30866 > unrolled thread
| Started by | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| First post | 2012-10-06 00:52 -0400 |
| Last post | 2012-10-06 23:52 +1000 |
| Articles | 3 — 3 participants |
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Re: write binary with struct.pack_into Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-10-06 00:52 -0400
Re: write binary with struct.pack_into Grant Edwards <invalid@invalid.invalid> - 2012-10-06 13:26 +0000
Re: write binary with struct.pack_into Chris Angelico <rosuav@gmail.com> - 2012-10-06 23:52 +1000
| From | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| Date | 2012-10-06 00:52 -0400 |
| Subject | Re: write binary with struct.pack_into |
| Message-ID | <mailman.1891.1349499136.27098.python-list@python.org> |
On Fri, 5 Oct 2012 20:27:36 -0700 (PDT), palmeira <palmeira@gmail.com>
declaimed the following in gmane.comp.python.general:
>
> #WRITE
> fb=open('testOUT.bin')
Unless you specify otherwise, open() defaults to read-only
--
Wulfraed Dennis Lee Bieber AF6VN
wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/
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| From | Grant Edwards <invalid@invalid.invalid> |
|---|---|
| Date | 2012-10-06 13:26 +0000 |
| Message-ID | <k4pbik$6qf$1@reader1.panix.com> |
| In reply to | #30866 |
On 2012-10-06, Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:
> On Fri, 5 Oct 2012 20:27:36 -0700 (PDT), palmeira <palmeira@gmail.com>
> declaimed the following in gmane.comp.python.general:
>
>>
>> #WRITE
>> fb=open('testOUT.bin')
>
> Unless you specify otherwise, open() defaults to read-only
It also defaults to 'text' mode which does cr/lf translaction. That
will break both reads and writes on any binary file containing 0x0a
and 0x0d bytes.
--
Grant
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| From | Chris Angelico <rosuav@gmail.com> |
|---|---|
| Date | 2012-10-06 23:52 +1000 |
| Message-ID | <mailman.1902.1349531571.27098.python-list@python.org> |
| In reply to | #30889 |
On Sat, Oct 6, 2012 at 11:26 PM, Grant Edwards <invalid@invalid.invalid> wrote:
> On 2012-10-06, Dennis Lee Bieber <wlfraed@ix.netcom.com> wrote:
>> On Fri, 5 Oct 2012 20:27:36 -0700 (PDT), palmeira <palmeira@gmail.com>
>> declaimed the following in gmane.comp.python.general:
>>
>>>
>>> #WRITE
>>> fb=open('testOUT.bin')
>>
>> Unless you specify otherwise, open() defaults to read-only
>
> It also defaults to 'text' mode which does cr/lf translaction. That
> will break both reads and writes on any binary file containing 0x0a
> and 0x0d bytes.
And, in Python 3, it'll be returning Unicode characters too, unless
the decode fails. You definitely want binary mode.
ChrisA
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