How to save a binary file?

hidura at gmail.com hidura at gmail.com
Wed Oct 6 16:25:57 CEST 2010


When you put the 'wb' extension you have to pass a Encode the string Python  
does not accept a string on a wb file, Python3

On Oct 6, 2010 1:01am, Chris Rebert <clp2 at rebertia.com> wrote:
> > On Oct 5, 2010 8:03pm, MRAB python at mrabarnett.plus.com> wrote:

> >> On 05/10/2010 23:50, hidura at gmail.com wrote:

> >> I did but the mistake is: Error interpreting JPEG image file (Not a  
> JPEG

> >> file: starts with 0x5c 0x6e)

> >>

> >> I think the problem is maybe in the binary code here is:



> >> > On Oct 5, 2010 6:18pm, "Jonas H." jonas at lophus.org> wrote:

> >> > > On 10/05/2010 11:11 PM, hidura at gmail.com wrote:

> >> > > Hello, how i can save a binary file, i read in the manual in the IO

> >> area

> >> > > but doesn' t show how to save it.

> >>

> >> > > Here is the code what i am using:

> >> > > s = open('/home/hidura/test.jpeg', 'wb')

> >> > > s.write(str.encode(formFields[5]))

> >> > > s.close()



> >> Why are you encoding it? A JPEG file should contain the binary data,

> >> not a textual encoding of its bytes. The error message you got said

> >> that the contents of the file started with a backslash.

> >>

> >> If you print out, say, repr(str[ : 10]) you should get something like

> >>

> >> 'ÿØÿà\x00\x10JFIF'.

> >>

> >> Try this instead:

> >>

> >> s = open('/home/hidura/test.jpeg', 'wb')

> >> s.write(str)

> >> s.close()

> >>

> >> Incidentally, 'str' is a bad name for a variable because it's the name

> >> of the built-in string type.



> On Tue, Oct 5, 2010 at 9:53 PM, hidura at gmail.com> wrote:

> > I has to use repr to convert in this string: ÿØÿà\x00\x10JFIF?



> No, you don't/shouldn't convert it at all. Read/use the 3 lines of

> suggested code that MRAB gave:

> s = open('/home/hidura/test.jpeg', 'wb')

> s.write(str)

> s.close()



> Cheers,

> Chris

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