[issue46594] Windows "Edit with IDLE >" only has one selection

[Steve Dower]

Steve Dower  added the comment:

True. I guess we need to dig a little deeper to find a cause here. Any 
other ideas?

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[issue46594] Windows "Edit with IDLE >" only has one selection

[Eryk Sun]

Eryk Sun  added the comment:

> the Open With entries may not be being merged.

That would probably be a bug in the Windows shell API. The HKCU and HKLM 
subkeys of "Software\Classes\Python.File\Shell\editwithidle\shell" are merged 
in the HKCR view. The same key path can exist in both hives, for which the view 
contains the union, with precedence for HKCU.

For example, with "Software\Classes\spam":

import winreg

hkm = winreg.CreateKey(winreg.HKEY_LOCAL_MACHINE, r'Software\Classes\spam')
winreg.SetValueEx(hkm, 'eggs', 0, winreg.REG_SZ, 'hklm')
winreg.SetValueEx(hkm, 'baz', 0, winreg.REG_SZ, 'hklm')

hku = winreg.CreateKey(winreg.HKEY_CURRENT_USER, r'Software\Classes\spam')
winreg.SetValueEx(hku, 'eggs', 0, winreg.REG_SZ, 'hkcu')
winreg.SetValueEx(hku, 'bam', 0, winreg.REG_SZ, 'hkcu')

hkr = winreg.OpenKey(winreg.HKEY_CLASSES_ROOT, 'spam')

>>> winreg.EnumValue(hkr, 0)
('bam', 'hkcu', 1)
>>> winreg.EnumValue(hkr, 1)
('baz', 'hklm', 1)
>>> winreg.EnumValue(hkr, 2)
('eggs', 'hkcu', 1)

>>> winreg.EnumValue(hkr, 3)
Traceback (most recent call last):
  File "", line 1, in 
OSError: [WinError 259] No more data is available

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[issue46594] Windows "Edit with IDLE >" only has one selection

[Steve Dower]

Steve Dower  added the comment:

I wonder if you've managed to install the launcher a second time? If the second 
one is for current user but the first is for local machine, the Open With 
entries may not be being merged.

In theory, the installer is supposed to detect a previous launcher and match 
its setting, but the default did change recently, so maybe the detection is not 
working.

Not sure when I'll get a chance to check it out, so if someone else wants to 
check and confirm that would be helpful.

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[issue46594] Windows "Edit with IDLE >" only has one selection

[Terry J. Reedy]

Terry J. Reedy  added the comment:

The registry settings should be correctly set by the installer.  The bug is 
that they are not.  I don't touch the registry, and the last 3 versions are 
less than 2 weeks old.

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[issue46594] Windows "Edit with IDLE >" only has one selection

[Eryk Sun]

Eryk Sun  added the comment:

Check your settings in the registry.

In "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts" there 
should be a ".py" key, but not necessarily. It should have an "OpenWithList" 
subkey that contains an "MRUList" value (most recently used list). The value 
should be a sequence of letters, each of which should be a value name in the 
key. If the launcher was last used to open a ".py" file, the first letter in 
the list should be a value with the data "py.exe".

Ideally there should also be a subkey named "UserChoice" that contains a 
"ProgId" (programmatic identifier) value with the data "Python.File". This sets 
the "Python.File" ProgID as the locked-in user choice for ".py" files. In the 
GUI, you can set this in the open-with dialog by selecting "always use this app 
to open .py files". The selected app should be "Python", with an icon that 
contains the Python logo and a rocket (the launcher).

If ".py" isn't the locked-in user choice, the shell API will use the most 
recent user selection in the open-with menu. If there's no user selection, the 
default association is calculated from "HKCR\.py", which is a merged view of 
"[HKCU|HKLM]\Software\Classes\.py". The default value of "HKCR\.py" sets the 
default file association. Ideally it should be "Python.File".

"HKCR\Python.File" is a merged view of 
"[HKCU|HKLM]\Software\Classes\Python.File". For the merged view, if a value 
name is defined in the same subkey of HKCU and HKLM, the view prefers the HKCU 
value. There should be a subkey named "shell\editwithidle\shell". It should 
define one or more subkeys named "edit3*", such as "edit310". Each should 
contain a "MUIVerb" value that sets the command description in the "open-with" 
menu. There should also be a "command" subkey that contains the template 
command as its default value, e.g. ""C:\Program Files\Python310\pythonw.exe" -m 
idlelib "%L" %*".

--
nosy: +eryksun

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[issue46594] Windows "Edit with IDLE >" only has one selection

[Terry J. Reedy]

New submission from Terry J. Reedy :

I have Python and hence IDLE 3.8, 3.9, 3.10, and 3.11 installed.  When I right 
click a .py file, and then on "Edit with IDLE >" the sub-menu only has 
'3.11.0a4' listed.  This negates the purpose of having a submenu.

I did some search of previous issues and see a) that I have had more than one 
version listed before, but b) there have been previous issues with some 
missing.  I don't know if #27603 has any relevance.

I discovered this when investigating the report at
https://stackoverflow.com/questions/70931009/cant-open-py-files-in-idle-on-desktop-with-python-3-10-2
For that, clicking on the submenu worked for 3.9 but not after upgrading to 
3.10. Clicking for me opened the file, but there was only one choice.

--
components: Installation, Windows
messages: 412224
nosy: paul.moore, steve.dower, terry.reedy, tim.golden, zach.ware
priority: normal
severity: normal
stage: needs patch
status: open
title: Windows "Edit with IDLE >" only has one selection
type: behavior
versions: Python 3.10, Python 3.11, Python 3.9

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