puzzle about file Object.readlines()

[Gabriel Genellina]

On 19 mar, 16:05, Dave Angel <da... at ieee.org> wrote:
> On 01/-10/-28163 02:59 PM, MRAB wrote:
> > On 19/03/2011 13:15, 林桦 wrote:
> >> i use python 2.5. os is window 7.
> >> the puzzle is :python don't read the leave text when meet character:
> >> chr(26)
> >> the code is:
> >> /fileObject=open('d:\\temp\\1.txt','w')
> >> fileObject.write('22222222222222\r\n')
> >> fileObject.write(chr(26)+'\r\n')
> >> fileObject.write('33333333333333')
> >> fileObject.close()
> >> fileObject=open('d:\\temp\\1.txt','r')
> >> i=0
> >> for line in fileObject:
> >> i+=1
> >> print str(i)+'******'+line
> >> fileObject.close()/
>
> >> the output only print:
> >> />>>
> >> 1******22222222222222/
>
> >> but can't print next line text:/'33333333333333'' 。who tell me why?
> >> /
>
> > chr(26) can sometimes be used in text files to indicate the end of the text.
>
> > In Microsoft Windows it dates from MS-DOS, which borrowed from CP/M, an
> > operating
> > system which stored the file size as the number of 128-byte records.
> > chr(26) was used to
> > indicate where the text ended in the last record.
>
> On Win a ctrl-z is end of file.  So if you want to read beyond the end
> of a text file, you have to pretend it's binary.  Open it with  "rb"
> instead of "r"

Using mode "rU" may be more convenient, because it still translates \r
\n into \n but disregards chr(26) as a special marker.

--
Gabriel Genellina