Re: [Tutor] Why does os.path.realpath('test_main.py') give different results for unittest than for testing statement in interpreter?

2018-01-09 Thread eryk sun 
On Tue, Jan 9, 2018 at 2:48 PM, Albert-Jan Roskam
 wrote:
>
> I think that it would be a great enhancement if os.realpath would return the 
> UNC path if
> given a mapped drive in Windows, if needed as extended path (prefixed with 
> "\\?\UNC\").
> That's something I use all the time, unlike symlinks, in Windows.

pathlib can do this for you, or call os.path._getfinalpathname. I
recently helped someone that wanted the reverse, to map the resolved
UNC path back to a logical drive:

https://bugs.python.org/issue32442

> And I would also welcome a convenience function in the os.path module that 
> does
> expanduser, expandvars, normpath, realpath, and maybe more.

pathlib implements expanduser, but it's still lame on Windows for a
user other than the current user. It assumes all user profiles are in
the same directory instead of directly getting the user's profile
path. Anyway, expanduser is of limited use.

We can't assume in general that a user's special folders (e.g.
Desktop, Documents) are in the default location relative to the
profile directory. Almost all of them are relocatable. There are shell
APIs to look up the current locations, such as SHGetKnownFolderPath.
This can be called with ctypes [1]. For users other than the current
user, it requires logging on and impersonating the user, which
requires administrator access.

[1]: https://stackoverflow.com/a/33181421/205580

You can log a user on without a password by calling LsaLogonUser to
request an MSV1 S4U (service for user) logon. The access token will
only be identification level, unless the script is running as a SYSTEM
service. But identification level is enough to query the location of a
user's known folders. I don't recommended calling LsaLogonUser via
ctypes if you have the option to write an extension module in C/C++,
but I did manage to get it working with ctypes [2]. For example:

>>> from security_lsa import logon_msv1_s4u
>>> from knownfolders import FOLDERID, get_known_folder_path

>>> logon_info = logon_msv1_s4u('Administrator')
>>> get_known_folder_path(FOLDERID.Desktop, logon_info.Token)
'C:\\Users\\Administrator\\Desktop'

[2]: https://stackoverflow.com/a/4322/205580

Also, please don't use expanduser to enable applications to spam the
profile directory with configuration files and directories. Use the
local and roaming application data directories.
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Re: [Tutor] delete strings from specificed words

2018-01-09 Thread Alan Gauld via Tutor 
On 09/01/18 14:20, YU Bo wrote:

> But, i am facing an interesting question.I have no idea to deal with it.

I don;t think you have given us enough context to
be able to help much. WE would need some idea of
the input and output data (both current and desired)

> [PATCH] perf tools: Fix copyfile_offset update of output offset
> 
> We need to increase output offset in each iteration,
> not decrease it as we currently do.
> 

It sounds like you are building some kind of pretty printer.
Maybe you could use Pythons pretty-print module as a design
template? Or maybe even use some of it directly. It just
depends on your data formats etc.

> In fact, this is a patch from lkml,my goal is to design a kernel podcast
> for myself to focus on what happened in kernel. 

Sorry, I've no idea what lkml is nor what kernel you are talking about.

Can you show us what you are receiving, what you are
currently producing and what you are trying to produce?

Some actual code might be an idea too.
And the python version and OS.

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
Follow my photo-blog on Flickr at:
http://www.flickr.com/photos/alangauldphotos


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[Tutor] delete strings from specificed words

2018-01-09 Thread YU Bo 

Hi,

I am learning python to reslove issue,which make happy:)

But, i am facing an interesting question.I have no idea to deal with it.

The text i will working as follow:

```text

[PATCH] perf tools: Fix copyfile_offset update of output offset

We need to increase output offset in each iteration,
not decrease it as we currently do.

I guess we were lucky to finish in most cases in first
iteration, so the bug never showed. However it shows a
lot when working with big (~4GB) size data.

Link: http://lkml.kernel.org/n/tip-f4az7t2nxjbjz5tqrv83z64e@xx
Signed-off-by: Jiri Olsa 
---
tools/perf/util/util.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index a789f952b3e9..443892dabedb 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -210,7 +210,7 @@ static int copyfile_offset(int ifd, loff_t off_in, int ofd, 
loff_t off_out, u64

size -= ret;
off_in += ret;
-   off_out -= ret;
+   off_out += ret;
}
munmap(ptr, off_in + size);

--
2.13.6

```
In fact, this is a patch from lkml,my goal is to design a kernel podcast
for myself to focus on what happened in kernel. I have crawled the text
with python and want to remove strings from *diff --git*, because reading
the git commit above, i have a shape in head.

I have tried split(), replace(), but i have no idea to deal with it.

I will  appericate if you have any idea.

Thanks!
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Re: [Tutor] Why does os.path.realpath('test_main.py') give different results for unittest than for testing statement in interpreter?

2018-01-09 Thread Albert-Jan Roskam 
From: Tutor  on behalf of 
Steven D'Aprano 
Sent: Tuesday, January 9, 2018 8:47 AM
To: tutor@python.org
Subject: Re: [Tutor] Why does os.path.realpath('test_main.py') give different 
results for unittest than for testing statement in interpreter?

  
> The Python 3.5 source code for os.path.realpath under Windows looks like 
> this:
>
># realpath is a no-op on systems without islink support
> realpath = abspath

Déjà-vu [1], but I think that it would be a great enhancement if os.realpath 
would return the UNC path if given a mapped drive in Windows, if needed as 
extended path (prefixed with "\\?\UNC\"). That's something I use all the time, 
unlike symlinks, in Windows. 

And I would also welcome a convenience function in the os.path module that does 
expanduser, expandvars, normpath, realpath, and maybe more.

I haven't used pathlib yet. Will os.path development some day be frozen so 
pathlib becomes the standard? It seems to be nicer.

[1] http://python.6.x6.nabble.com/Tutor-getUncPath-mappedDrive-td4652304.html
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Re: [Tutor] Why does os.path.realpath('test_main.py') give different results for unittest than for testing statement in interpreter?

2018-01-09 Thread Steven D'Aprano 
On Mon, Jan 08, 2018 at 05:08:49PM -0600, boB Stepp wrote:
> Hi Steve,
> 
> On Mon, Jan 8, 2018 at 12:47 AM, Steven D'Aprano  wrote:
> 
> > As I actually explained in my previous email, the one which has
> > disappeared into the aether, ...
> 
> Do you still have the email you sent?  I would like to read it if you
> don't mind sending it to me.

Mystery solved. I've been sending to the wrong email address...

Fixed now, and re-sent to the list.


-- 
Steve
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