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Title: Misleading error on creating already existed symlink
Type: behavior Stage: resolved
Components: Extension Modules, Windows Versions: Python 3.4
Status: closed Resolution: duplicate
Dependencies: Superseder: Bad error message in os.rename,, and os.symlink
View: 16074
Assigned To: Nosy List: serhiy.storchaka, vajrasky
Priority: normal Keywords: patch

Created on 2013-12-01 09:57 by vajrasky, last changed 2022-04-11 14:57 by admin. This issue is now closed.

File name Uploaded Description Edit
fix_error_message_on_creating_already_existed_symbolic_link.patch vajrasky, 2013-12-01 09:57 review
fix_python_33_windows_create_existed_symlink.patch vajrasky, 2013-12-01 14:10 Python 3.3 review
Messages (5)
msg204899 - (view) Author: Vajrasky Kok (vajrasky) * Date: 2013-12-01 09:57
Steps to reproduce the bug:
1. Download cute cat picture from internet. Name it CuteCat.jpg.

>>> import os
>>> os.listdir('.')

2. Create symbolic link.

>>> os.symlink('CuteCat.jpg', 'Aaawww.lnk')
>>> os.listdir('.')
['Aaawww.lnk', 'CuteCat.jpg']

3. Do it again.

>>> os.symlink('CuteCat.jpg', 'Aaawww.lnk')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
FileExistsError: [Errno 17] File exists: 'CuteCat.jpg'

Amusingly, it only happens on 3.4 (both Windows and Linux). 3.3 gives correct error message (in Linux, I did not test it on Windows). 2.7 omits the file information (in Linux, I did not test it on Windows). I'll check again the behaviour on Windows for 2.7 and 3.3.

Do we need unit test for this? Will we change the error message again in the future? For now, I omit it. Let me know if we need unit test.
msg204900 - (view) Author: Vajrasky Kok (vajrasky) * Date: 2013-12-01 10:04
Python 2.7 on Windows does not have symlink.

Python 3.3 on Windows got the same symptom as Python 3.4. Do we need to fix it?
msg204919 - (view) Author: Vajrasky Kok (vajrasky) * Date: 2013-12-01 14:10
This is the patch for Python 3.3.
msg204940 - (view) Author: Serhiy Storchaka (serhiy.storchaka) * (Python committer) Date: 2013-12-01 15:59
There are several similar issues on the tracker.
msg204943 - (view) Author: Serhiy Storchaka (serhiy.storchaka) * (Python committer) Date: 2013-12-01 16:08
See issue16074.
Date User Action Args
2022-04-11 14:57:54adminsetgithub: 64047
2013-12-01 20:56:47Arfreversetnosy: - Arfrever
2013-12-01 16:08:13serhiy.storchakasetstatus: open -> closed
superseder: Bad error message in os.rename,, and os.symlink
messages: + msg204943

resolution: duplicate
stage: resolved
2013-12-01 15:59:41serhiy.storchakasetnosy: + serhiy.storchaka
messages: + msg204940
2013-12-01 14:55:55Arfreversetnosy: + Arfrever
2013-12-01 14:10:26vajraskysetfiles: + fix_python_33_windows_create_existed_symlink.patch

messages: + msg204919
2013-12-01 10:04:25vajraskysetmessages: + msg204900
2013-12-01 09:57:54vajraskycreate