| msg29150 - (view) |
Author: Lior (rudnik_lior) |
Date: 2006-07-12 22:04 |
| Python 2.5b1 (r25b1:47027, Jun 20 2006, 09:31:33) Assuming documentation is correct: (from seek() help "Note that if the file is opened for appending (mode 'a' or 'a+'), any seek() operations will be undone at the next write" Doing the following is __not__ undoing the seek operation after calling this a few times (Simplified code snippet): from __future__ import with_statement with open(path,'a+') as f: f.seek(0,2) # go to end pos = f.tell() f.seek(0,0) line = f.readline().strip() f.seek(0,2) # go to end, not effective if opened with mode a/a+ (currently bug?) f.write("something") Calling the above code repeatedly didnt increase the file size beyond 166 bytes (in my code) |
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| msg29151 - (view) |
Author: Lior (rudnik_lior) |
Date: 2006-07-12 22:09 |
| Logged In: YES user_id=1364480 Re-tried the code with empty file - it doesnt grow beyond creating and writting at position 0 so it seems the seek does influence the write position. |
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| msg29152 - (view) |
Author: Neal Norwitz (nnorwitz) *  |
Date: 2006-07-13 06:29 |
| Logged In: YES user_id=33168 This seems to work for me on Linux. Maybe we are testing differently. What o/s and version are you using? Does this work with Python 2.4? Can you attach a complete test case that demonstrates this problem? Thanks. |
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| msg29153 - (view) |
Author: Georg Brandl (georg.brandl) * |
Date: 2006-07-13 07:43 |
| Logged In: YES user_id=849994 I also cannot see any problem with the above code and can append to a file indefinitely. What exactly are you expecting the code to do, and what do you get? Which OS is this? |
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| msg29154 - (view) |
Author: Lior (rudnik_lior) |
Date: 2006-07-28 13:35 |
| Logged In: YES user_id=1364480 This issue is on windows XP. Wasnt tested on other versions (only 2.5b1 and b2) I expect the code to always write at the end according to the documentation. However if I user file seek (opend as A+) to read from begining of the file, the write also goes to begining of file. Note - in the code snippet, please remove the last f.seek(0,2) to see the problem! (it should have been in a comment) |
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| msg29155 - (view) |
Author: Georg Brandl (georg.brandl) * |
Date: 2006-07-28 18:54 |
| Logged In: YES user_id=849994 Perhaps you can try in on Windows, Tim... |
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| msg84506 - (view) |
Author: Daniel Diniz (ajaksu2) *  |
Date: 2009-03-30 05:06 |
| Can anyone confirm this for Windows and 2.6? Closing otherwise. |
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| msg86001 - (view) |
Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) * |
Date: 2009-04-15 21:25 |
| I can't reproduce it with python2.6 on Vista. The newer C runtime (msvcr90.dll) probably corrected this. |
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