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How to get 'od' run?

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  How to get 'od' run? fl <rxjwg98@gmail.com> - 2015-11-11 19:04 -0800
    Re: How to get 'od' run? Michael Torrie <torriem@gmail.com> - 2015-11-11 20:21 -0700
    Re: How to get 'od' run? Michael Torrie <torriem@gmail.com> - 2015-11-11 20:34 -0700

#98667 — How to get 'od' run?

Hi,

I am learning python. I see a previous post has such code:





   >>> data = '"binääridataa"\n'.encode('utf-8') 
   >>> f = open('roska.txt', 'wb') 
   >>> f.write(data) 
   17 
   >>> f.close() 

The .encode methods produced a bytestring, which Python likes to display 
as ASCII characters where it can and in hexadecimal where it cannot: 

   >>> data 
   b'"bin\xc3\xa4\xc3\xa4ridataa"\n' 

An "octal dump" in characters (where ASCII, otherwise apparently octal) 
and the corresponding hexadecimal shows that it is, indeed, these bytes 
that ended up in the file: 

$ od -t cx1 roska.txt 


When I run the above line with python 2.7, it does not recognize 'od'.

Is it from a package? Or some internal function?

Thanks,

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#98668

On 11/11/2015 08:04 PM, fl wrote:
> Hi,
> 
> I am learning python. I see a previous post has such code:
> 
> 
> 
> 
> 
>    >>> data = '"binääridataa"\n'.encode('utf-8') 
>    >>> f = open('roska.txt', 'wb') 
>    >>> f.write(data) 
>    17 
>    >>> f.close() 
> 
> The .encode methods produced a bytestring, which Python likes to display 
> as ASCII characters where it can and in hexadecimal where it cannot: 
> 
>    >>> data 
>    b'"bin\xc3\xa4\xc3\xa4ridataa"\n' 
> 
> An "octal dump" in characters (where ASCII, otherwise apparently octal) 
> and the corresponding hexadecimal shows that it is, indeed, these bytes 
> that ended up in the file: 
> 
> $ od -t cx1 roska.txt 
 ^^^
This is most likely a bash prompt. Therefore "od" is a program on your
computer.  Nothing to do with Python at all.

To get Python to display \x## hex codes for non-ascii characters in a
byte stream, you can print out the repr() of the byte string.  For example:

print (repr(my_unicode_string.encode('utf-8')))

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#98669

On 11/11/2015 08:21 PM, Michael Torrie wrote:
> On 11/11/2015 08:04 PM, fl wrote:
>> Hi,
>>
>> I am learning python. I see a previous post has such code:
>>
>>
>>
>>
>>
>>    >>> data = '"binääridataa"\n'.encode('utf-8') 
>>    >>> f = open('roska.txt', 'wb') 
>>    >>> f.write(data) 
>>    17 
>>    >>> f.close() 
>>
>> The .encode methods produced a bytestring, which Python likes to display 
>> as ASCII characters where it can and in hexadecimal where it cannot: 
>>
>>    >>> data 
>>    b'"bin\xc3\xa4\xc3\xa4ridataa"\n' 
>>
>> An "octal dump" in characters (where ASCII, otherwise apparently octal) 
>> and the corresponding hexadecimal shows that it is, indeed, these bytes 
>> that ended up in the file: 
>>
>> $ od -t cx1 roska.txt 
>  ^^^
> This is most likely a bash prompt. Therefore "od" is a program on your
> computer.  Nothing to do with Python at all.
> 
> To get Python to display \x## hex codes for non-ascii characters in a
> byte stream, you can print out the repr() of the byte string.  For example:
> 
> print (repr(my_unicode_string.encode('utf-8')))

Also there are numerous recipes for doing standard hex dumps out there.
 For example,

http://code.activestate.com/recipes/142812-hex-dumper/

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