[issue32050] Deprecated python3 -x option

[STINNER Victor]

Change by STINNER Victor :


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[issue32050] Deprecated python3 -x option

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 733b5f3f2f2425fa939d71bc317f2e0f1968c2a0 by Victor Stinner in 
branch '2.7':
bpo-32050: Fix -x option documentation (#4423)
https://github.com/python/cpython/commit/733b5f3f2f2425fa939d71bc317f2e0f1968c2a0


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[issue32050] Deprecated python3 -x option

[STINNER Victor]

STINNER Victor  added the comment:

Ok, I will update the doc instead of deprecating the option.

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[issue32050] Deprecated python3 -x option

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

It seems to me that the best way is to add the following line at the start of 
the script:

@path\to\python -x %0 %* & exit /b

Or

@py -3 -x %0 %* & exit /b

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[issue32050] Deprecated python3 -x option

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

The current short line of the description was enough to me for understanding 
what is the purpose of this option and how it can be used (I didn't use Windows 
for more than 10 years). But I was surprised not founding more detailed 
information about this feature in the documentation. Definitely it should be 
better documented. Most of users will have no ideas about this feature.

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[issue32050] Deprecated python3 -x option

[Terry J. Reedy]

Terry J. Reedy  added the comment:

So the hack is not specific to DOS but is still needed for Windows .bat files. 
They run in Command Prompt, which was once called the DOS box.  (I don't know 
if they work unaltered in PowerShell.)  It seems that the doc should be updated.

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[issue32050] Deprecated python3 -x option

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Yes, of course. The py launcher is not an alternative to this "hack". It just 
allows you to specify just "py" (with possible options -2, -3, -3.6) instead of 
hardcoding the full name to the Python binary or add the path to directory 
containing the Python binary to your PATH.

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[issue32050] Deprecated python3 -x option

[STINNER Victor]

STINNER Victor  added the comment:

> @path\to\python -x %0 %1 %2 %3 %4 %5 %6 %7 %8 %9

Oh wow, I never saw that before.

There is now a "py" launcher on Windows, do we still need such "hack"?

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[issue32050] Deprecated python3 -x option

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

The same as on DOS.

Change the extension of the Python script from .py to .bat, and insert the 
following first line:

@path\to\python -x %0 %1 %2 %3 %4 %5 %6 %7 %8 %9

Now you can run it as a bat-file. The command in the first line will run 
Python, passing the name of this file and up to 9 arguments (you can make it 
passing more than 9 arguments, but I don't remember the syntax). "@" disables 
printing this command itself. The first line is not valid Python syntax, but 
due to the -x option it will be skipped.

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[issue32050] Deprecated python3 -x option

[STINNER Victor]

STINNER Victor  added the comment:

> Python still supports Windows.

What is the use case for this option on Windows?

On Unix, the first line is usually used for the shebang, a line like:

   #!/usr/bin/env python3

But this shebang is seen as a comment in Python and Python simply ignore the 
shebang, seen as a comment.

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[issue32050] Deprecated python3 -x option

[STINNER Victor]

Change by STINNER Victor :


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[issue32050] Deprecated python3 -x option

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Python still supports Windows.

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[issue32050] Deprecated python3 -x option

[STINNER Victor]

STINNER Victor  added the comment:

The note in the documentation is wrong: the line number is correct when using 
the -x option, even if the first line is skipped.

Example with Python 2.7:
---
$ cat x.py 
print(1)
print(2)
x

$ python2 x.py 
1
2
Traceback (most recent call last):
  File "x.py", line 3, in 
x
NameError: name 'x' is not defined

$ python2 -x x.py 
2
Traceback (most recent call last):
  File "x.py", line 3, in 
x
NameError: name 'x' is not defined
---

Attached PR 4423 fixes Python 2.7 documentation.

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[issue32050] Deprecated python3 -x option

[STINNER Victor]

Change by STINNER Victor :


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keywords: +patch
pull_requests: +4370
stage:  -> patch review

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[issue32050] Deprecated python3 -x option

[STINNER Victor]

New submission from STINNER Victor :

Python has a -x option documented as a "DOS specific hack only":
https://docs.python.org/dev/using/cmdline.html#cmdoption-x

Python doesn't support MS-DOS since Python 2.1:
https://www.python.org/dev/peps/pep-0011/#no-longer-supported-platforms

I propose to deprecate the option in Python 3.7: using it emits a 
DeprecationWarning, option deprecated in the documentation; and remove the 
option in Python 3.8.

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components: Interpreter Core
messages: 306365
nosy: haypo
priority: normal
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status: open
title: Deprecated python3 -x option
versions: Python 3.7

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