Fwd: Problem with writing a long line in a text file

Matthew Barnett mrabarnett at mrabarnett.plus.com
Thu Nov 20 22:39:06 CET 2008

Steve Holden wrote:
> Mohsen Akbari wrote:
>> Dear guys,
>> I'm a newbie in python and I have this problem with the code that I'm
>> writing. There is a very long line which I wish to output it to a text
>> file.But when I do this, in the output file, the result appears in two
>> lines. I thought maybe that's because the maximum possible length of the
>> text file has been reached so I opened the file and I tried to put some
>> space at the end of the first line. It wasn't possible to do that for
>> the first line and the space was placed before the first character of
>> the second line. I kept pressing space bar to add more spaces and so the
>> whole second line was moved to the write till it exceeded the first
>> line. I mean the length of the second line became longer than the first
>> line which means the text file can accept longer lines.
>> As a second guess, I thought maybe I had '\n' somewhere in my input
>> string so I tried to check that by doing:
>>     temp_ =  out_string.find('\n')
>>     print temp_
>> The result was  -1 which I think means there is not '\n' in my output
>> string. Now I'm really confused and I don't know what to do. I really
>> appreciate it if somebody can help me out.
>> BTW, I'm using windows.
> Then, later:
>> --- I use notepad to view my txt file. It appears that way in this tool.
>> --- Here is the output of the debug lines that you mentioned:
>> print *line*.find('\n')
>> -1
>> print len(*line*)
>> 1528
>> print repr(line)
> '0.0\t3.0\t10.0\t24.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t33.0\t40.0\t40.0\t40.0\t40.0\t32.0\t30.0\t32.0\t26.0\t23.0\t30.0\t32.0\t40.0\t40.0\t40.0\t40.0\t40.0\t40.0\t38.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t24.0\t10.0\t11.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t18.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t17.0\t20.0\t23.0\t30.0\t30.0\t30.0\t27.0\t20.0\t20.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t30.0\t23.0\t20.0\t20.0\t20.0\t20.0\t10.0\t10.0\t14.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t27.0\t30.0\t30.0\t27.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t19.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t12.0\t10.0\t13.0\t13.0\t10.0\t2.0\t0.0\t3.0\t5.0\t10.0\t5.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t5.0\t0.0\t2.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t10.0\t16.0\t
> .0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t10.0\t18.0\t20.0\t20.0\t20.0\t20.0\t20.0\t20.0\t27.0\t30.0\t30.0\t35.0\t40.0\t40.0\t31.0\t20.0\t20.0\t21.0\t30.0\t33.0\t46.0\t50.0\t50.0\t50.0\t48.0\t40.0\t43.0\t50.0\t50.0\t50.0\t56.0\t60.0\t60.0\t60.0\t61.0\t70.0\t70.0\t70.0\t70.0\t75.0\t80.0\t83.0\t90.0\t90.0\t92.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t93.0\t86.0\t80.0\t91.0\t100.0\t100.0\t100.0\t100.0\t98.0\t90.0\t90.0\t90.0\t94.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t100.0\t90.0\t83.0\t87.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t90.0\t'
>> thanks
>> Mohsen
> There is only one line in your file. Notepad just can't display lines
> beyond a certain length, is all, so it inserts a line break in the
> window (but not in the file).
Some text editors can display very long lines, others can't and just 
wrap them when displaying. Notepad can't.

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