问题
Seems as though an update on Windows 10 overnight broke Python. Just trying to run python --version returned a "Permission Denied" error. None of the three updates; KB4507453, KB4506991, or KB4509096 look like they'd be the culprit but the timing of the issue is suspicious. Rather than messing with rolling back, I'm hoping there's a simpler fix that I'm missing.
The permissions on python are "-rwxr-xr-x" and I haven't changed anything besides letting the Windows update reboot machine after installing last night's patches.
According to the System Information, I'm running 10.0.18362
Should also note that this is happening whether I (try) to execute Python from git-bash using "run as administrator" or not, and if I try using PowerShell, it just opens the Windows store as if the app isn't installed so I'm thinking it can't see the contents of my /c/Users/david/AppData/Local/Microsoft/WindowsApps/ folder for some reason.
I've also tried to reinstall Python 3.7.4, but that didn't help either. Is there something else I should be looking at?
回答1:
As far as I can tell, this was caused by a conflict with the version of Python 3.7 that was recently added into the Windows Store. It looks like this added two "stubs" called python.exe and python3.exe into the %USERPROFILE%\AppData\Local\Microsoft\WindowsApps folder, and in my case, this was inserted before my existing Python executable's entry in the PATH.
Moving this entry below the correct Python folder (partially) corrected the issue.
The second part of correcting it is to type "manage app execution aliases" into the Windows search prompt and disable the store versions of Python altogether.
It's possible that you'll only need to do the second part, but on my system I made both changes and everything is back to normal now.
回答2:
Research
All of the files in %USERPROFILE%\AppData\Local\Microsoft\WindowsApps are placeholders that point to files that are actually located somewhere in C:\Program Files\WindowsApps, which happens to be denied permissions completely.
It appears I was on the right track with my statement made in my duplicate of this problem:
"Seems like they didn't really think about the distribution method screwing with permissions!"
Source: Cannot install pylint in Git Bash on Windows (Windows Store)
Permissions are screwed up royally because of the WindowsApps distribution method:
Interestingly it says that the "Users" group can read and execute files, as well as my specific user, but the Administrators group can only List folder contents for some hilariously unfathomable reason. And when trying to access the folder in File Explorer, it refuses to even show the folder contents, so there's something fishy about that as well.
Interestingly, even though executing python in CMD works just fine, the "WindowsApps" folder does not show up when listing the files in the directory it resides in, and attempting to navigate into the folder generates a "Permission denied" error:
Attempting to change the permissions requires changing the owner first, so I changed the owner to the Administrators group. After that, I attempted to change the permissions for the Administrators group to include Full control, but it was unable to change this, because "access was denied" (duh, Micro$ucks, that's what we're trying to change!).
This permission error happened for so many files that I used Alt+C to quickly click "Continue" on repeat messages, but this still took too long, so I canceled the process, resulting in this warning message popping up:
And now I am unable to set the TrustedInstaller user back as the owner of the WindowsApps folder, because it doesn't show up in the list of Users/Groups/Built-in security principles/Other objects. *
*Actually, according to this tutorial, you can swap the owner back to TrustedInstaller by typing NT Service\TrustedInstaller into the object name text box.
Solution
There is no solution. Basically, we are completely screwed. Classy move, Microsoft.
回答3:
This appears to be a limitation in git-bash. The recommendation to use winpty python.exe worked for me. See Python not working in the command line of git bash for additional information.
回答4:
It's not a solution with PowerShell, but I had the same problem except with MINGW64. I got around it by switching to Windows Subsystem for Linux (which I wanted to do anyways) as my terminal, just generally and in VSCode. This post describes it well:
How to configure VS Code (windows) to use Ubuntu App as terminal
In summary:
1) Install Ubuntu from the Windows App Store
2) Change the default bash from CMD -> wslconfig /setdefault Ubuntu
--- For VSCode
3) Restart VSCode
4) In VSCode change "terminal.integrated.shell.windows" to "C:\WINDOWS\System32\bash.exe" (for further details see the post above)
Running smoothly now in VSCode and WSL (Bash on Ubuntu on Windows). Might be at least a temporary solution for you.
回答5:
May be you can try opening command prompt with Administrator privileges. (Run As Administrator). Works for me most of the time.
来源：https://stackoverflow.com/questions/56974927/permission-denied-trying-to-run-python-on-windows-10