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Title: Fail to create file if name starts with prn.
Type: behavior Stage: resolved
Components: IO, Windows Versions: Python 3.3
Status: closed Resolution: not a bug
Dependencies: Superseder:
Assigned To: Nosy List: borisompol, martin.panter, steve.dower, tim.golden, zach.ware
Priority: normal Keywords:

Created on 2015-05-14 22:01 by borisompol, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (3)
msg243219 - (view) Author: Boris (borisompol) Date: 2015-05-14 22:01
>>> f=open('prn.txt','w')
Traceback (most recent call last):
  File "<pyshell#80>", line 1, in <module>
FileNotFoundError: [Errno 2] No such file or directory: 'prn.txt'

Names that fail:

Names that do not fail:

Happens on Windows 7, Python3.3, both 32 bit and 64 bit
This should be easy to replicate.
msg243224 - (view) Author: Martin Panter (martin.panter) * (Python committer) Date: 2015-05-14 22:18
I could be wrong, but I thought this was normal Windows behaviour, not related to Python. Same probably applies to other special names like NUL, COM1.
msg243226 - (view) Author: Steve Dower (steve.dower) * (Python committer) Date: 2015-05-14 22:22
It's a name reserved by Windows - see

If you have a full (and 100% resolved) path, you can prefix it with \\?\ (plus escaping) to access a file by that name, but I wouldn't recommend it as you'll probably break Explorer.

In any case, this is an OS limitation and not a Python issue.
Date User Action Args
2022-04-11 14:58:16adminsetgithub: 68384
2015-05-14 22:55:26pitrousetstatus: open -> closed
stage: resolved
2015-05-14 22:22:34steve.dowersetresolution: not a bug
messages: + msg243226
2015-05-14 22:18:28martin.pantersetnosy: + martin.panter, tim.golden, zach.ware
messages: + msg243224
components: + Windows
2015-05-14 22:02:34pitrousetnosy: + steve.dower
2015-05-14 22:01:13borisompolcreate