From b201823f631082d4f386304ee9ec24b0d85f5def Mon Sep 17 00:00:00 2001 From: Eli Zaretskii Date: Thu, 14 Apr 2022 09:17:01 +0300 Subject: [PATCH] Describe problems with invoking Python on MS-Windows * etc/PROBLEMS: Describe problems with running an inferior Python interpreter due to the MS-Windows "App Execution Aliases" feature. (Bug#54860) --- etc/PROBLEMS | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/etc/PROBLEMS b/etc/PROBLEMS index e48ce5a8b0c..5e88f289c26 100644 --- a/etc/PROBLEMS +++ b/etc/PROBLEMS @@ -651,6 +651,46 @@ And then rename the system's readline so that it won't be loaded: See for more details on installation. +*** On MS-Windows, invoking "M-x run-python" signals an error. + +If the error says something like this: + + Python was not found; run with arguments to install + from the Microsoft Store, or disable this shortcut + from Settings > Manage App Execution Aliases. + + Process Python exited abnormally with code 49 + +then this is due to the MS-Windows "feature" that is intended to +encourage you to install the latest available Python version. It +works by placing "fake" python.exe and python3.exe executables in a +special directory, and having that directory on your Path _before_ the +directory where the real Python executable is installed. That "fake" +Python then decides whether to redirect you to the Microsoft Store or +invoke the actual Python. The directory where Windows keeps those +"fake" executables is under your Windows user's 'AppData' directory, +typically 'C:\Users\\AppData\Local\Microsoft\WindowsApps', where +"" is the user name of your Windows user. + +To solve this, you have several alternatives: + + . Go to "Settings > Manage App Execution Aliases" and turn OFF the + aliases for python.exe and/or python3.exe. This will affect only + Python, and may require you to manage upgrades to your Python + installation manually, instead of being automatically prompted by + MS-Windows. + . Move the directory with the "fake" executables to the end of Path, + or at least after the directory where the real Python is + installed. Depending on the position in Path where you move it, + it will affect Python and/or other programs which Windows monitors + via the "App Execution Aliases" feature. + . Manually remove python.exe and/or python3.exe from the above + directory. Again, this affects only your Python installation. + +Whatever you do, you will need to restart Emacs to refresh its notion +of the directory where python.exe/python3.exe lives, because that is +recorded when Python mode is started. + *** Visiting files in some auto-mounted directories causes Emacs to print 'Error reading dir-locals: (file-error "Read error" "is a directory" ...' -- 2.39.2