Re: writing on file not until the end
Alexzive wrote: I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Do you check the contents of the resulting file by feeding it to another program? 53, 0.170973146505, 0.0466686190136 57, 0.231749688431, 0.0405121944142 t60, 0.250420691759, 0.0399644155193 58, 0.234883810317, 0.0488399925217 61, 0.2666025, 0.03541845 There's a t at the start of the line after the last line you claim to see, so maybe your input file is corrupt and your reader stumbles over that line. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
On May 25, 8:38 am, Peter Otten __pete...@web.de wrote: Alexzive wrote: I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Do you check the contents of the resulting file by feeding it to another program? 53, 0.170973146505, 0.0466686190136 57, 0.231749688431, 0.0405121944142 t60, 0.250420691759, 0.0399644155193 58, 0.234883810317, 0.0488399925217 61, 0.2666025, 0.03541845 There's a t at the start of the line after the last line you claim to see, so maybe your input file is corrupt and your reader stumbles over that line. Peter Thank you all for replying. - yes, I oversaw the t at 60, 0.250420691759, 0.0399644155193. I then removed it for the following tests - changing from e-1 to e apparently solved the problem, BUT I then realized it was just because a second access to the file (still open) seems to be the real solution -- after Nfile.close() e retrying with e instead of e-1 the problem is still there. - I also tryied to inizialize e and i to zero -- nothing changes - until now, the only solution which works is to repeat the code while the file is still open, which means a quite redundant code: linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
Alessandro wrote: - until now, the only solution which works is to repeat the code while the file is still open, which means a quite redundant code: linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) Is this the complete script? The only effect of the second copy of your code above is that it implicitly closes the first Nfile. Otherwise it is cargo cult. Peter -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
On May 25, 6:30 pm, Alessandro zasaconsult...@gmail.com wrote: On May 25, 8:38 am, Peter Otten __pete...@web.de wrote: Alexzive wrote: I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Do you check the contents of the resulting file by feeding it to another program? 53, 0.170973146505, 0.0466686190136 57, 0.231749688431, 0.0405121944142 t60, 0.250420691759, 0.0399644155193 58, 0.234883810317, 0.0488399925217 61, 0.2666025, 0.03541845 There's a t at the start of the line after the last line you claim to see, so maybe your input file is corrupt and your reader stumbles over that line. Peter Thank you all for replying. - yes, I oversaw the t at 60, 0.250420691759, 0.0399644155193. I then removed it for the following tests - changing from e-1 to e apparently solved the problem, BUT I then realized it was just because a second access to the file (still open) seems to be the real solution -- after Nfile.close() e retrying with e instead of e-1 the problem is still there. - I also tryied to inizialize e and i to zero -- nothing changes - until now, the only solution which works is to repeat the code while the file is still open, which means a quite redundant code: linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) Insert here: Nfile.close() Remove the redundant second pass. linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
On May 25, 10:58 am, John Machin sjmac...@lexicon.net wrote: On May 25, 6:30 pm, Alessandro zasaconsult...@gmail.com wrote: On May 25, 8:38 am, Peter Otten __pete...@web.de wrote: Alexzive wrote: I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Do you check the contents of the resulting file by feeding it to another program? 53, 0.170973146505, 0.0466686190136 57, 0.231749688431, 0.0405121944142 t60, 0.250420691759, 0.0399644155193 58, 0.234883810317, 0.0488399925217 61, 0.2666025, 0.03541845 There's a t at the start of the line after the last line you claim to see, so maybe your input file is corrupt and your reader stumbles over that line. Peter Thank you all for replying. - yes, I oversaw the t at 60, 0.250420691759, 0.0399644155193. I then removed it for the following tests - changing from e-1 to e apparently solved the problem, BUT I then realized it was just because a second access to the file (still open) seems to be the real solution -- after Nfile.close() e retrying with e instead of e-1 the problem is still there. - I also tryied to inizialize e and i to zero -- nothing changes - until now, the only solution which works is to repeat the code while the file is still open, which means a quite redundant code: linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) I closed and restarted the python console. Now this code (with added Nfile.close() at the end) seems to work properly: linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] Nfile = open(N.txt, w) Nfile.write(textN) Nfile.close() thanks, Alex -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
Alessandro wrote: snip I closed and restarted the python console. Now this code (with added Nfile.close() at the end) seems to work properly: linestring = open(path, 'r').read() i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] Nfile = open(N.txt, w) Nfile.write(textN) Nfile.close() thanks, Alex Others had already mentioned close(), but I didn't bother, since it would be automatically closed when you exited the function, or finished the script. I never dreamed you were running all this from the interpreter. If so, why didn't you copy the prompts? The close is best done explicitly, but it is implicit when the Nfile goes out of scope, or gets reassigned (like the new open). However, the bug I described is still there. Study the following, and try it: def test(): buf = abcdefghijklmnopqrstg000 i = buf.index(d) e = buf.index(g, i+10) buf2 = buf[i+2:e-1] print buf2 running it produces the string: fghijklmnopqrs Notice the 't' is missing. If you're deliberately doing that, fine. But I doubt it. -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
On Sun, May 24, 2009 at 2:46 PM, Alexzive zasaconsult...@gmail.com wrote: Hello, I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Many thanks for your help! Alex the original file to crop (in path) looks like this: [snip file] I didn't test this, but I would guess you're seeing this because of buffering. Try adding Nfile.flush() to the end. -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
On Sun, 24 May 2009 19:46:01 +0100, Alexzive zasaconsult...@gmail.com wrote: Hello, I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Cutting and pasting (and substituting the sample file for `path`), it works for me on Python 2.6.2 (Ubuntu Linux). It must be something to do with the context you're calling the code in. Are you checking the output before the program has finished running or something? -- Rhodri James *-* Wildebeeste Herder to the Masses -- http://mail.python.org/mailman/listinfo/python-list
Re: writing on file not until the end
Alexzive wrote: Hello, I am a newby with python. I wrote the following code to extract a text from a file and write it to another file: linestring = open(path, 'r').read() #read all the inp file in linestring i=linestring.index(*NODE) i=linestring.index(E,i) e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list Nfile = open(N.txt, w) Nfile.write(textN) unfortunately when I check N.txt some lines are missing (it only crop until 57, 0.231749688431, 0.0405121944142 but I espect the final line to be 242, 0.2979675, 0.224605896461. I check textN and it has all the lines until 242..) when I try Nfile.write(textN) again it writes some more lines but still not all! what is wrong whit this? Many thanks for your help! Alex the original file to crop (in path) looks like this: snip Is there a reason you used e-1 instead of e in the slice? That's going to chop off the last newline. And in some (broken) text viewers, you might not see the partial line. Also, it'll behave a bit different in Windows than in one of the Unix variants, due to newline being represented by two characters instead of one. e=linestring.index(*,i+10) textN = linestring[i+2:e-1] # crop the ELement+nodes list -- http://mail.python.org/mailman/listinfo/python-list
