I installed 3.8.7, the dependencies didn't match up with the project I was trying so I uninstalled 3.8.7 and wanted to try 3.8.0. I get this error every time.
Things I've tried:
Using Windows "Remove apps and programs". Doing this results in an error "No python 3.8 installation was found", an incredibly frustrating contradiction.
Trying everything from this thread, including removing environment variable paths, deleting registry \SOFTWARE\Python\PythonCore3.8 (it was only there for HKEY_CURRENT_USER and wasn't there for HKEY_LOCAL_MACHINE)
Tried uninstalling 3.8.7 with my 3.8.7 installation .exe, which brings up a "Modify Setup" screen (so it recognizes an installation somehow), but clicking uninstall brings up an error "No Python 3.8 installation was detected." I also tried the "Repair" option, which gives the same error. Choosing the "Modify" option shows me where another installation was (on my OS hard drive) that I deleted, and then ultimately going through with the modify process resulted in the same error as the other two options.
Every time I run a Python uninstallation it recreates the registry keys and the folders, but in the OS drive where none of my installations are. I can't direct the uninstallation program to uninstall from another path.
I'm thinking it's a combination of choosing my own installation paths (which is almost always never worth the trouble it causes) and the fact that my Python paths are not on my OS drive.
I had the same problem, do the follwoing:
Modify your installation
go to Settings -> Apps
search for pyton 3.8
click on modify instate of unistall
execute the modification with default settings
enter image description here
Reinstall python
use the installer and install python again
I am having trouble installing a few modules on my Windows computer (namely TensorFlow). I used to have Python 3.5 and 3.7 installed on this computer, but have since uninstalled Python 3.5 through the Control Panel. However, when I try to check the version of PIP, I get the following error:
Fatal error in launcher: Unable to create process using '"c:\users\yoonh\appdata\local\programs\python\python35\python.exe" "C:\Users\yoonh\appdata\local\programs\python\python35\Scripts\pip.exe" --version'
Meanwhile, following other instructions and using py -m pip ... gives me the following error:
WARNING: pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
I would really appreciate if someone could help me solve this issue! Thank you!
From the information you provided, it looks like you still have Python 3.5 installed for your account locally, or some leftovers from it.
First, if you just uninstalled Python 3.5, make sure that you closed and restarted your command prompt from the Start Menu after uninstalling Python. To be extra sure, restart your system just to ensure that the uninstallation is fully complete (it may not be if e.g. some files from it were in use while you were uninstalling. Windows Installer tells you if this happens and that you need to restart but many users have a bad habit of not reading warnings.).
Run appwiz.cpl as yourself (without elevation) and uninstall Python 3.5 if present
Delete c:\users\yoonh\appdata\local\programs\python\python35 and anything under it; delete it from PATH, too, if present (run SystemPropertiesAdvanced -> "Environment variables")
Check the registry at HKCU\Software\Python\PythonCore and HKCU\Software\Wow6432Node\Python\PythonCore and same under HKLM for any subkeys pointing to installations that don't actually exist
Python(x,y) was previously installed on my computer but I had to reinstall it due to some reasons. The problem occurs when I try to install it again. I get a message at the beginning of the installation where it says "could not write updated path to HKLM." I have cleared almost the entire registry of everything that mentions python in any way, deleted all python folders and deleted python from the system path but the problem will not go away.
Any solutions?
I decided to get pip and other python packages via homebrew after receiving answers to a question I asked earlier: How do I install the pip package for python on mac osx?
So I installed homebrew, and then ran the 'brew doctor' command in terminal after it finished. When I did this, I got a warning saying:
"Warning: You have leftover files from an older version of Xcode.
You should delete them using:
/Developer/Library/uninstall-developer-folder"
I ran the suggested command "/Developer/Library/uninstall-developer-folder" but all I got in return was "Can't determine system version"
I tried manually looking up the uninstall-dev files, but when I ran one it gave me an error message saying it
"must be run with root permissions -- prefix command with 'sudo'"
I did some research and some sites were suggesting to run the command:
"sudo /Developer/Library/uninstall-devtools --mode=all"
but it seemed like that would delete all versions of xcode, including the 5.1 version that I want to keep. Is there anyway to safely delete the older versions of xcode on my computer without corrupting the current version or any other files? I'm a little reluctant to use sudo without knowing for sure what will happen. Thanks.
Apple states you can just delete the developer folder that previous versions used for tools / frameworks. I did this a bit ago and it was fine.
I confirmed this on apple's website too:
"Previous versions of Xcode placed the tools and frameworks in the Developer folder. You can delete the older version of Xcode by dragging the Developer folder to the trash."
See https://developer.apple.com/support/xcode/
some months ago, I installed Python 2.7 on my laptop (my os is Windows 7).
After, I decided to use Python xy 2.7.3 instead of 'pure' Python; so, as suggested, I removed Python 2.7 and tried to install Python xy 2.7.3. However, when I tried to run the .exe file for installation, a warning window appears telling me that Python 2.7 is already installed on my computer. I tried to install a different version of Python xy (2.6) and everything went fine; however, I'd really prefer to use the latest version of Python xy.
Actually, I can't figure out what went wrong whie uninstalling Python 2.7; does someone have any clue?
I can tell you that I followed the 'normal' procedure for programm uninstalltion; control panel -> Programs -> Remove Program
Thanks in advance
Stefano
Run regedit, backup and delete the registry keys:
HKEY_LOCAL_MACHINE\Software\Python\
HKEY_CURRENT_USER\Software\Python
My problem occurred when changing from Canopy to Python(x,y).
So, also delete all folders that are left behind when uninstalling.
https://support.enthought.com/entries/23580651-Uninstalling-Canopy
I also had this issue as well. It was due to third party installs. Even though you have uninstalled python, it leaves all the third party libraries that were installed and I think Python(x,y) just detects the directory.
To fix, uninstall Python 2.7 and then check to see if C:\Python27 still exists. If it does, go ahead and delete and then try installing Python(x,y). That is what worked for me.
I faced this issue: I tried to uninstall the python and fresh install, reason my pip version issue was not getting resolved. So I deleted the python folder, removed python from system path, and when I tried to uninstall from "Uninstall a program" in control panel, it showed "Windows installation package" error window and could not clean uninstall.
Solution what i found was: In the "Uninstall a program" select python and click repair. And then uninstall the python, it worked for me. Hope this helps and save some time.
PS: I am pretty new to python, and any help correcting me would be appreciated.
Maybe to put an answer out there.
Uninstalling anything from windows can have multiple side effects residing completly on your specific machine. As to what is common:
-> Python sets itself in your windows path. Here is how to modify your windows path: http://www.computerhope.com/issues/ch000549.htm
It means that there is a probability that python is gone but the path entry might not be. That is a guess however -> more information needed
-> Are you sure that everything was removed from your computer? If you already did the normal uninstalling process - try to look up if any python directory is still present.
-> Thirdparty installed? Have you downloaded any libs that are still on your machine.
Besides from that - it could be anything - the more information you give us the more we can say about it.
Maybe this post will help you: How to completely remove Python from a Windows machine?
I had python 2.7.12 and wanted to uninstall it for 2.7.9. I had the same problem as you and to fix it I tried to delete all of the local files and then uninstall however it still gave me the same error. So instead I decided to repair the python 2.7.12 and then uninstall which worked perfectly and completely got rid of the error.
I had python 2.7 installed and enthought canopy. I wanted to switch to python(x,y) to access a full version of the OpenCV library. python(x,y) installation complained about python 2.7 already being installed after:
1)Using windows control panel
2)Removing all lingering python files
3)Removing the windows path as suggested above
Not until I removed all registry entries related to python/enthough did python(x,y) install without issue.
I installed Enthought before. When I wanted to install Python(x,y) instead, I met the problems above.
After I had tried to uninstall Enthought and Python(x,y) from the Control Panel and then restart the PC, the problem still occured the next time I installed Python(x,y).
I solved this problem by:
deleting all the relevant files in C:/User/UserName/AppData/ about Python, including the third party softwares like Enthought;
deleting the Path in user and system Environment;
=====the two steps were failed if I didn't do the third step.=====
deleting the register keys as #Daniel said. (include all the relevant keys with the prefix py if you installed the third party software about Python. )
HKEY_LOCAL_MACHINE\Software\Python\
HKEY_CURRENT_USER\Software\Python
Locate that set up file which was used to install Python. Run it and choose repair. If that doesn't solve the problem. Go to c:\Python(x,y) and delete this folder completely by shift+Del.
Run that set up file again and click on "Change" which will ultimately install the Python again. By default in my case option to add path and making that version of Python the default on my system was unchecked which can be figured out by seeing the red cross mark in one of the installation screen. Click on it if you want set up to make it default Python version and also click on the option to indicate you want the path to be added in windows environment variable.
No need to touch registry as previous ones will be overwritten again.
In my case it worked. I was getting error like:
Fatal Python error: Py_Initialize: unable to load the file system codec
LookupError: no codec search functions registered: can't find encoding
Besides that un-installation was failing from control panel. So above steps solved all of my problem. Hope it helps.
I Repaired/Modified to install all the components for the Python
version I wanted to uninstall.
Once that was done, I clicked on Uninstall/Change and that uninstalled it for good.