[issue28137] Windows sys.path file should be renamed

[Donald Stufft]

Changes by Donald Stufft :


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pull_requests: +992

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[issue28137] Windows sys.path file should be renamed

[Steve Dower]

Steve Dower added the comment:

Decided to go with "DLLNAME._pth" or "EXENAME._pth", since using ".pth" with 
"import site" causes files to be reevaluated.

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resolution:  -> fixed
stage: needs patch -> resolved
status: open -> closed

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[issue28137] Windows sys.path file should be renamed

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7b47c98f24da by Steve Dower in branch '3.6':
Issue #28137: Renames Windows path file to ._pth
https://hg.python.org/cpython/rev/7b47c98f24da

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[issue28137] Windows sys.path file should be renamed

[Paul Moore]

Paul Moore added the comment:

I'd prefer not to hard code __main__.py, as I'd quite like to be able to have a 
number of copies of the executable, each running its own script. (I foresee 
putting all my little Python utility scripts in a directory with a Python 
installation and a set of launchers).

BTW, see https://github.com/pfmoore/pylaunch for a very quickly put together, 
but working, prototype. Whatever the conclusion here, I'll probably continue 
working on this. Unless the embedded python.exe completely subsumes the 
functionality :-)

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[issue28137] Windows sys.path file should be renamed

[Steve Dower]

Steve Dower added the comment:

I like it. Making the name match the exe name should have been obvious, and if 
nobody is opposed to simply aborting on unsupported syntax (i.e. imports other 
than site) I don't actually mind making it .pth.

It's a separate idea, but what if the presence of a __main__.py file caused 
that file to always run and every argument gets passed to that instead? The 
purposes seem separate enough to use two files. And we could implement that 
part easily enough in PC/WinMain.c, as Paul suggests.

Both of these options are fairly aggressive wrt other command line options 
(i.e. how do you specify unbuffered IO? how do you set the hash seed?), but the 
point is really that you wouldn't use them with these options - if you don't 
want to build your own main() function, the defaults should be good enough.

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[issue28137] Windows sys.path file should be renamed

[Paul Moore]

Paul Moore added the comment:

You can actually handle this already, with a simple wrapper program (based on 
the one in PC\WinMain.c):

/* Minimal main program -- everything is loaded from the library. */

#include "Python.h"

#define WIN32_LEAN_AND_MEAN
#include 

int wmain()
{
wchar_t **myargv = malloc((__argc + 3) * sizeof(wchar_t*));
int i;
myargv[0] = __wargv[0];
myargv[1] = L"myapp.zip";
for (i = 1; i < __argc; ++i) {
myargv[1+i] = __wargv[i];
}
myargv[1+i] = 0;
return Py_Main(__argc+1, myargv);
}

This injects your application name "myapp.zip" as the first argument and then 
calls the Python main interpreter. Run this with a conventional embedded 
Python, and you have a standalone application.

You can easily tidy the above sample up (it's just a quick hack) to make it 
generic by working out the name of the zipped Python application from the exe 
name.

But thanks for the idea - I hadn't really thought about doing something like 
this until you prompted me to investigate.

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[issue28137] Windows sys.path file should be renamed

[Wolfgang Langner]

Wolfgang Langner added the comment:

If this is only for the use case of embedded distribution we are now only to 
steps away to provide a easy custom shipping of applications for Windows.

1. Take the file name of the executable to load a custom EXECUTABLENAME.path 
file
2. Allow to specify a main to be executed or a pyz zipapp to be run with the -m 
switch. Or simply use first line of the path file if it contains "-m myapp".

With this by only renaming the python.exe and having a simple text file with 
the information, custom applications distribution can be done.

Sorry, I know not directly related to this.

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[issue28137] Windows sys.path file should be renamed

[Steve Dower]

Steve Dower added the comment:

Part of the reason it was so cute is that it directly specifies the contents of 
sys.path. But I like __syspath__.path (I'm scared of making it a ".ini" because 
I don't want to parse a more complex format).

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[issue28137] Windows sys.path file should be renamed

[Christian Heimes]

Christian Heimes added the comment:

I don't want to start a bike-shedding discussion but how about a name that 
can't be confused with a module and attribute? It's hard to distinguish between 
sys.path and sys.path in a discussion. How do you like the idea of a file name 
like __syspath__.path? __omitregistry__.path is even more search engine 
friendly.

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[issue28137] Windows sys.path file should be renamed

[Steve Dower]

New submission from Steve Dower:

The Windows getpath implementation gained the ability to find and read a 
sys.path file to skip reading the registry.

While the name is cute, it really ought to start with a leading underscore 
(i.e. "_sys.path") to indicate that it is very at-your-own-risk. The docs 
should be updated to indicate that its behavior may be changed in later 
versions of Python (though it's guaranteed to only change backwards-compatibly 
for 3.6).

Since the file is only used with a specific installation of Python 
(specifically the embedded distro), this shouldn't be an issue as nobody is 
meant to upgrade Python without removing/replacing this file.

--
assignee: steve.dower
components: Windows
messages: 276343
nosy: paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
stage: needs patch
status: open
title: Windows sys.path file should be renamed
type: behavior
versions: Python 3.6, Python 3.7

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