Develop Reference

VSCode requires me to re-select my python interpreter each time it starts

[edited!]
Everytime I start Microsoft Visual Code, I get the following alert:
This behavior started a few days ago (after a windows's update). I can select the python interpreter and after that, everything works just fine. From within vscode, I can open a terminal in my virtual environment and I can launch the debugger for django.
The problem is that once I quit vscode, it forgets. Next time I start it up, I have to repeat the process. I have to do it every time.
My environment is:
Windows 11
wsl2
Ubuntu 22.04
pyenv (python 3.9.15 selected)
poetry
I've tried the following:
Researched issue.
Tried Python: Clear Cache
Rollback of Python extension to version 2021-02. Restored to latest.
I'm out of ideas at this point. Is this a configuration issue? Any other ideas on how I can resolve this? This may be an extension issue, but I want to make sure I'm not doing something incorrect with visual code.

Apparently, this was an extension issue. I followed the github link to the python extension project and found a recently closed bug that looked similar. One of the comments suggested I try the pre-release version and my issue is no longer reproducible. Thanks everyone for the help.
https://github.com/microsoft/vscode-python/issues/20644

VSCode Python Extension: Extension host terminated unexpectedly

Running the latest version of VSCode: 1.61.2 in Windows 10. Everything was working fine until Yesterday when my Python extension gave me this error "Extension host terminated unexpectedly" and I'm unable to run or debug Python files in VSCode.
I did a complete removal of VSCode (including the App, the code folder in AppData, and the .vscode folder). But when I reboot, reinstall and run VSCode and install the Python extension by Microsoft v2021.10.1365161279, I get the exact same error.
It seems like this should just work like it has for me for many years. Is there any way to find out what is breaking it?
I can successfully open and run Python files in remote WSL instances using VSCode, just not in Windows.
[Edit: The problem turns out to be Mozilla VPN. If I exclude VSCode from it, then the Python extension works.]

Lots of people reporting issues with the Python extension on Windows right now. There's an alleged fix for the fatal performance issues here, for example, but this hasn't made it into the regular update cycle yet afaik.
I'd suggest using VS Code Insiders or disable the Python extension for the time being or find a way to revert to an earlier Python extension version.
[Update] It looks like the changelog for 2021.10.2 (20 October 2021), to version v2021.10.1365161279, includes the following fixes:
Ensure we filter out unsupported features in web scenario using
shellExecutionSupported context key. (#17811)
Fix unresponsive
extension issues caused by discovery component. (#11924)
Update debugpy to 1.5.1 to ensure user-unhandled exception setting is false by default. (#17789)
So, I'd test uninstalling and reinstalling the Microsoft Python extension. It works for me with this new update.

It turns out the problem is my Mozilla VPN. If I turn it off, then my Python extension works, and it also works if I exclude VSCode from the VPN.

importing dlls with pythonnet in spyder

I have a python package that acts like a wrapper for a .dll written in C#. The binary is imported into python by the pythonnet package. Thus, the user can access the functionality of the so called cs_backend.dll conveniently from the python side. The import looks as follows:
import clr as __clr
import System as __System
__clr.AddReference(PATH_TO_CS_BACKEND + "\\cs_backend")
import cs_backend as __csb # exception thrown here
However, it seems that python can't import the .dll as I get a ModuleNotFoundError: No module named 'cs_backend'.
The odd thing is that this error only occures when running the code from Spyder. Executing exactly the same code from Visual Studio Code works perfectly fine.
Do you have any idea what the problem could be?
system specifications
os: windows 10
.net framework v4.5.1
python 3.8.5
spyder 4.2.1
Edit:
I have found a github issue on the pythonnet repository that describes a similar (although not quite the same) problem. However, since it has been open for about 3 years, it seems that there is little to no progress on that.
Edit 2:
There is a similar question here on stack overflow. The solution was to install a newer .NET Framework. This is not my problem since with any IDE other than Spyder the code works just fine. Thus, I guess that this is mainly a Spyder issue.

Currently, it seems that there is neither a solution nor an effort to resolve this problem.
It looks like the problem is caused by the IPython console integrated in Spyder.
A simple workaround is to execute the python script from the system console.
In Spyder this can be done by going to Run - Configuration per file - Execute in external system console.
With the new configuration it is at least possible to run the script.

HTTP Error 502.2 - Bad Gateway Configuring IIS 7 with Python 2.7

I am a newbie to Stack Overflow (first post), but really see the use of this website.
I'm stumped. We are trying to setup IIS 7.0 to run with WinPython 2.7 on a Windows 7 machine.
I am an IIS newb, but veteran Python user. IIS 7 can NOT find a library, which python finds, and executes, perfectly when ran on it's own. When executed via IIS, the script fails with a traceback, and IIS returns the 502.2.
I found this thread http://forums.iis.net/p/1209465/2073173.aspx?HTTP+Error+502+2+Bad+Gateway+Frustrations but the advised solution is simply another troubleshooting suggestion.
I found IIS's description (http://support.microsoft.com/kb/942057) of the error helpful, but futile.
I found Python's start-up options/parameters helpful (http://docs.python.org/2/using/cmdline.html), but futile.
I found IIS's advice for configuring Python helpful (http://support.microsoft.com/kb/276494, but (questionably?) incomplete.
This thread on manually defining an alternate bin folder (http://forums.asp.net/t/1303052.aspx?Tell+IIS+to+load+dll+from+another+directory+not+Bin+web+config+) might be where my solution lies, but I don't think it is because of the fact that this all worked on 2.6 without doing that to IIS.
IIS seems to allow python to import any module that is just a python script. As soon as it gets to a *.pyd (basically just python's version of a dll file) file, it screams. I'm no pro when it comes to DLLs and windows environments, but wouldn't IIS have to have paths to a bin folder of some kind? Do I have to manually edit them, as discussed in the last link above?
ACTUAL ERROR Details below for DLL failed Load:
The Error :
" HTTP Error 502.2 - Bad Gateway The specified CGI application
misbehaved by not returning a complete set of HTTP headers. The
headers it did return are "Traceback (most recent call last): File
"\estorage.equitable.int\riskmgmt\Quants\web\LinksPage.py", line 2,
in import pyweb File
"\estorage.equitable.int\riskmgmt\Quants\Common2014\Python\pyweb__init__.py",
line 5, in from core import * File
"\estorage.equitable.int\riskmgmt\Quants\Common2014\Python\pyweb\core.py",
line 2, in from pylib import pgdb File
"\estorage.equitable.int\riskmgmt\Quants\Common2014\Python\pylib\pgdb.py",
line 8, in from scikits import timeseries as ts File
"C:\WinPython-32bit-2.7.6.2-20140401\python-2.7.6\lib\site-packages\scikits.timeseries-0.91.3-py2.7-win32.egg\scikits\timeseries__init__.py",
line 13, in import const File
"C:\WinPython-32bit-2.7.6.2-20140401\python-2.7.6\lib\site-packages\scikits.timeseries-0.91.3-py2.7-win32.egg\scikits\timeseries\const.py",
line 79, in from cseries import freq_constants ImportError:
DLL load failed: The specified module could not be found. ".
I'm confident that the python environment is configured properly, as the script runs from the same executable (python.exe) via a command line. I'm thinking that I don't have IIS configured properly, for the new Python 2.7 install. The same script worked yesterday, on IIS and python 2.6. But during our upgrade from 2.6 to 2.7, a bunch of PATH and PYTHONPATH parameters all changed, plus we went from ActivePython to WinPython. WinPython is "registered" on the machine.
What I've tried
confirming python's sys.path is as expected at run-time in both IIS and command line - it is.
using the module from python command line.
recompiling the failing module using two different compilers (ming32 and VS2008).
putting duplicates of my new 2.7 modules in the old python26 folder.
pulling out lots of hair and other hacky stuff.
My next step, is to post this same message on a python forum. If anybody can advise on a good one for python-IIS related challenges, that would be appreciated.
Please help! Thanks in advance.

I got this 502.2 error when doing a clean installation of PHP 5.5 in Windows Server 2012 R2 with IIS 8.5.
It turns out PHP is a Visual C++ application which needs the library MSVCR110.dll in order to run properly. My computer does not have Visual Studio 2012 installed and thus it does not have this file. I got my problem solved by installing the Visual C++ Redistributable Packages https://www.microsoft.com/en-us/download/details.aspx?id=30679#

(Note: jc77 is my associate, and I'm actually the OP, as this was an x-post from IIS forums.)
We solved the problem.
tl,dr; portable python + sloppy/rookie compiling = strange behaviour + frustrations.
Bottom line, compile properly. For scikits.timeseries, using ming32 everything will walk, talk, and sound like it works in Spyder.exe, but not in python.exe. You have to use VS2008, if you want it to work in both.
More Info:
Winpython (as well as others) presents itself as identical to any other python installations, if you "register" the installation. It works great, 99% of the time. We learned the hard way, that "Winpython Interpreter.exe" and "python.exe" provided in the install are in fact different. Can't explain why, but the two executables gave different behavior. We were doing all our testing in Spyder, which must use "winpython interpreter.exe". The module which IIS couldn't find, would import and run no problem in Spyder. Then, in IIS, using python.exe, the module wouldn't import. We were operating on the assumption that the IDE would use python.exe, and that the stack was identical. As, 99% of the time, they appear to be. The way we were compiling scikits worked in winpython interpreter.exe. We were making a rookie mistake when compiling scikits, but it went un-noticed because it was working fine in our IDE (Spyder).
I'm adding these keywords for others : Anybody else who receives errors like this is likely using a portable python installation AND not compiling something properly. Winpython, Portable Python, eGenix, [and possibly?] Active State and Enthought Canopy.

While trying to configure CGI to run Perl in Windows 8.1, I had HTTP Error 502.2, but then I read loste's post and solved the problem. I had previously installed both Perl64 and Strawberry Perl. Although the IIS EventHandler pointed to only the Perl64 directory, both directories appeared in my Windows PATH variable. I prefer Strawberry Perl, so I changed the EventHandler to point to the Strawberry Perl directory and deleted the paths to Perl64 from the Windows PATH variable to solve the error.

Try this
print("Content-Type: text/html\n")
print("Hello Python World!")
You must specify the type of document

How do I handle an UnresolvedImport Eclipse (Python)

When I write import MySQLdb in Eclipse using the PyDev plugin, I get an unresolved import. However, the program runs without error. I can add an annotation to get the error to go away, but what is the right way to handle this?
How can I help Eclipse know that MySQLdb is there?

It sounds like MySQLdb is somewhere on your sys.path, but not on your Eclipse project's PYTHONPATH; in other words, Eclipse thinks you're going to get an import error at runtime because you haven't fully configured it. Google seems to say that you can alter this setting in Window->Preferences->Preferences->PyDev->Python Interpreter to include the path to your MySQLdb module.
For some help figuring out where MySQLdb might be living on your system:
Open an interactive interpreter,
import MySQLdb
If that succeeds, you can get a hint from: print MySQLdb.__file__; it may be the __init__ file in the package that you need to point the path at.

cdleary above provided the reason two years ago, but this may be easier. Basically, one reinstalls the interpreter.
Select Window - > Preferences -> PyDev -> Interpreter - Python
Select the python interpreter in the upper pane
Click on Remove
Click on Auto Config
Agree to everything.
This works on Fedora 17 using the Eclipse 4.2.0 that came with the package management.

Fixed this by doing two things:
1) Added MySQLdb egg to the PYTHONPATH under Window->Preferences->Preferences->PyDev->Python Interpreter.
C:\Python26\Lib\site-packages\MySQL_python-1.2.3c1-py2.6-win32.egg
2) Close and re-open the .py file that had the red x.

Adding the egg works, but the error remains. The solution for that error can be found by adding
##UnresolvedImport
To the import statement, as in:
import web ##UnresolvedImport
Source: http://klaith.wordpress.com/2009/06/12/pydev-unresolved-import-errors/

I once had a similar problem on Windows (never encountered this on Linux though) and I discovered that I had to include the .egg directory of my library to my PYTHONPATH.
For example my PYTHONPATH (Pydev/Interpreter - Python/Libraries) included:
C:\Python26\Lib\site-packages
and I had to add:
C:\Python26\Lib\site-packages\jinja2-2.2.1-py2.6.egg
to use jinja.

This surely works I just tried it with Pmw package. Unzip package in site-packages. Then remove python interpreter from eclipse and then add it again. Your import errors shall go away. also you may want add module to forced builtins. See How do I fix PyDev "Undefined variable from import" errors? and http://pydev.org/manual_101_interpreter.html

I had a similar issue and the following is what I did to solve my issue. I have a Windows 8 Machine, Python 2.7 installed and running my stuff through eclipse.
Some Background:
When I did an easy install it tries to install MySQL-python 1.2.5 which failed with an error: Unable to find vcvarsall.bat. I did an easy_install of pip and tried the pip install which also failed with a similar error. They both reference vcvarsall.bat which is something to do with visual studio, since I don't have visual studio on my machine, it left me looking for a different solution, which I share below.
The Solution:
Reinstall python 2.7.8 from 2.7.8 from https://www.python.org/download this will add any missing registry settings, which is required by the next install.
Install 1.2.4 from http://pypi.python.org/pypi/MySQL-python/1.2.4
After I did both of those installs, I reopened eclipse and got a prompt to update the paths of eclipse which I accepted, after that I was able to query my MySQL db.

import MySQLdb
If this code show error like this:
Unresolved import: MySQLdb
you should add D:\Python27\Lib\site-packages\MySQLdb to your sys.path.
D:\Python27\Lib\site-packages\MySQLdb is this location where you install MySQLdb in your computer disk. After this step, the error will disappear.