date:20220211

[issue40255] Fixing Copy on Writes from reference counting and immortal objects

2022-02-11 Thread Inada Naoki



Inada Naoki  added the comment:

I think making more objects immortal by default will reduce the gap, although I 
am not sure it can be 2%. (I guess 3% and I think it is acceptable gap.)

* Code attributes (contents of co_consts, co_names, etc...) in deep frozen 
modules.
  * only if subinterpreter shares them.
* Statically allocated strings (previously _Py_IDENTIFIER)

To reduce gap more, we need to reduce Python stack operation in ceval in some 
way.

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Re: PermissionError: [Errno 13] Permission denied: 'Abc.xlsx'

2022-02-11 Thread Dennis Lee Bieber

On Fri, 11 Feb 2022 20:37:57 +0100, "Peter J. Holzer" 
declaimed the following:

>Interestingly, Excel did have the ability for multiple users editing the
>same file at some time (maybe early 2000s? Way before Google docs or
>Office 365). It had to be explicitely enabled and it didn't work very
>reliably (at least not with Samba as file servers), so we never really
>used it but it is clear that somebody at MS thought that users needed or
>at least wanted that ability.

A quick Google does find mention of "shared workbooks":
https://docs.microsoft.com/en-us/office/troubleshoot/excel/use-shared-workbook
https://support.microsoft.com/en-us/office/what-happened-to-shared-workbooks-150fc205-990a-4763-82f1-6c259303fe05

The preferred mode requires "Microsoft 365 subscription" and latest
Office version:
https://support.microsoft.com/en-us/office/collaborate-on-excel-workbooks-at-the-same-time-with-co-authoring-7152aa8b-b791-414c-a3bb-3024e46fb104

However -- the key feature is that these are Excel-Excel(-Excel...)
operations (and the co-author mode needs M$ subscription and use of
OneDrive cloud storage). 

Most Python libraries are working directly with the Excel format data
file, not by running Excel. 

Caveat: there is a product that appears to use the Excel component API
to control Excel itself, not just read/write xls(*) files -- so it might
understand the older shared workbook mode, but I'd recommend a detailed
study of the API and the sharing operations first:
https://www.xlwings.org/
https://docs.xlwings.org/en/stable/
"""
xlwings (Open Source) is a BSD-licensed Python library that makes it easy
to call Python from Excel and vice versa:
*   Scripting: Automate/interact with Excel from Python using a syntax
close to VBA.
*   Macros: Replace VBA macros with clean and powerful Python code.
*   UDFs: Write User Defined Functions (UDFs) in Python (Windows only).
"""

If running under Windows, similar capability should be possible using
the win32py (or whatever the current name is) extension... Or with more
difficulty, ctypes!


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[issue46586] In documentation contents enum.property erroneously links to built-in property

2022-02-11 Thread Ethan Furman



Ethan Furman  added the comment:


New changeset 9d9cfd61ec3cbe84dbc25c74f664877f3d02b8ef by Meer Suri in branch 
'main':
bpo-46586: Fix documentation links (GH-31216)
https://github.com/python/cpython/commit/9d9cfd61ec3cbe84dbc25c74f664877f3d02b8ef


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[issue46666] IDLE Add indent guide

2022-02-11 Thread Terry J. Reedy

Terry J. Reedy added the comment:

I am guessing that N++ or its GUI framework uses a transparent overlay. For
tkinter, that would mean a transparent Canvas on which one could draw vertical
dotted gray lines 1-pixel wide. However, Serhiy Storchaka in msg213643 of
#20920 said: "Tk supports alpha only for photo images and as an attribute of
top-level window. It doesn't support alpha component in colors."

I searched 'tkinter transparent canvas'.

For pixel positioning, photos with transparent backgrounds can only be used on
a canvas. This was one of the answers to
https://stackoverflow.com/questions/53021603/how-to-make-a-tkinter-canvas-background-transparent
More details, using pil(low) to make images, are in the following:
https://www.tutorialspoint.com/how-to-make-a-tkinter-canvas-rectangle-transparent
https://www.javaer101.com/en/article/921105.html

Another answer to the SO question, for Windows only, was to pip install pywin32
and use various calls to make a canvas layered with a transparent colorkey.
Perhaps the same could be done, at least on Windows, with ctypes.

A top-level background is made (partially) transparent with
"top.attributes('-alpha', d)" where d in [0.0-1.0]. On Windows,
'top.wm_attributes('-transparentcolor', keycolor) makes that keycolor actually
be transparent, like the green/blue screen used in television and movies. But
any keycolor pixel in the toplevel exposes the screen beneath the toplevel, not
the widget in the toplevel. This detail is not clear in the tk docs.
https://www.youtube.com/watch?v=75jbNpc8vN4
What also is not clear is whether the keycolor applies only to the one toplevel
or all toplevels, nor what happens when one toplevel is over another.

I summarized the above so I or anyone else can find the information. I am
closing this issue for now, but someone can reopen if the situation changes.

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