I am trying to create a new python 3.7 virtual environment on my local computer running Windows 8. I have python versions 3.6, 3.7, and 3.8 installed. Their exe's are named python36, python37, and python, respectively. All three are correctly added to PATH because I can enter each interpreter.
Within my new project's directory I tried to create a virtual environment with python37 -m venv env. It produced an error: Error: [WinError 2] The system cannot find the file specified, but it still created the directory. However the Scripts subfolder is empty except for pythonw.exe.
In this question someone suggests doing python37 -m venv env --without-pip. When I tried this, the activation/deactivation scripts were created, but the virtual environment is using python 3.8.
It is my understanding that venv will create the virtual environment with what ever python exe you use to call it, so I don't understand how this can happen. I've verified that python37 points to the correct place with where python37, and can even enter the 3.7 interactive interpreter.
The problem was that I renamed the python exe's. I don't know exactly what goes wrong, but presumably at some point venv tries to find python.exe and is thrown off by the name.
Changing them back to python.exe and differentiating between the versions with their location fixed the problem.
Edit:
Check out Eryk's comments for more details.
First create folder at any drive then go to that folder and install virtualenv package using pip.
pip install virtualenv
Then create your virtual environment.
mkvirtualenv myvirtualenv
Then use below command to activate virtualenv in windows.
myvirtualenv\Scripts\activate
After this you can install related package in current virtual environment.
The Python Standard Library for Creating Virtual Environment
Related
I am running VSCode on Windows 10. I've set up a virtual environment and have installed a number of packages to the local site library.
I've activated my environment (The terminal prompt shows a .venv string)
However, when I attempt to import any of my local modules, I get an 'Module not found'
error.
Doing a pip list shows that the modules do exist in the virtual env.
I've verified that I'm running the Python executable in the virtual environment.
Printing sys.path gives the following output:
['', 'C:\Users\User\AppData\Local\Programs\Python\Python39\python39.zip', 'C:\Users\User\AppData\Local\Programs\Python\Python39\DLLs', 'C:\Users\User\AppData\Local\Programs\Python\Python39\lib', 'C:\Users\User\AppData\Local\Programs\Python\Python39', 'C:\Users\User\Documents\mednotes\.venv', 'C:\Users\User\Documents\mednotes\.venv\lib\site-packages']
The AppData path is, I believe the global Python namespace. Why is this even in my
sys.path in my local virtual env? I added the last two paths manually to see if this
would fix anything but no luck.
I'm really stuck here. Anybody have any suggestions for fixing this?
Thanks
Are you sure pip installed them to the correct place? Can you see the packages you installed under the C:\Users\User\Documents\mednotes\.venv\lib\python3.9\site-packages folder?
I would double-check where python3 and pip are getting picked up from. Try where python3 and where pip.
A virtual environment is a built-in way to create an environment to isolate the packages you install per workspace.
When you use a virtual environment, it will isolate the local package.
You can use shortcuts "Ctrl+Shift+P" and type "Python: Select Interpreter" to choose the correct interpreter.
Another way is to use conda install packageName command to install the package in the virtual environment.
I have created a virtual environment via the command line
python3.11 -m venv .
source ./bin/activate
python -m pip install NAME_OF_MODULE
source deactivate
I can see the installed modules when I run pip freeze (prior to deactiving). So far so good.
Then I launch VSCode, open a file and using the command palette, I click Python: Select Interpreter. I then navigate in the bin folder of the virtual environment to the Python installation, which consists of a short-cut / alias pointing to a global Python installation.
When I do this, I cannot import Python modules located in the virtual environment, only those in the global environment. In other words, it appears to be selecting the global environment.
Do I need to set this up within VSCode (Python: Create Environment) ? If so, I can only get so far as the official instructions (https://code.visualstudio.com/docs/python/environments) do not cover installing packages within a virtual environment.
Thanks
I managed to do this in VSCode, by choosing the Create Environment command from the Command Palette. This created a .venv folder where the Python installation is contained. Then when I go to select the Python interpreter via the Command Palette, it automatically finds the local installation. Then, I installed packages by opening the command line WITHIN VSCode (no need to activate environment - it is already automatically activated).
So the trick is to create the environment WITHIN VSCode, not using the system shell.
I have a python installation on my pc (windows 10) which comes from Anaconda. I am a data scientist and using conda as a package manager is very convenient for me.
However, sometimes I want to develop a small app or script to share with my colleagues. In these cases I create a project folder and python -m venv .venv inside it.
This way, I can install only the essential packages I need, and later share the requirements.txt file.
The issue I'm having, is that the python interpreter being used is still the default one, namely, the one that came with Anaconda, even if I activate the virtual environment and deactivate the conda one.
Specifically, if I run python in the terminal, I get this warning message:
Warning:
This Python interpreter is in a conda environment, but the environment has
not been activated. Libraries may fail to load. To activate this environment
please see https://conda.io/activation
This is rather inconvenient. My base python installation is 3.7, but if I wanted to use an earlier version, or 3.8, I can't seem to be able to choose.
I would expect that the python executable being used is the one in the current active environment, but this doesn't seem to be the case.
How can I obtain that?
First you have to install the version of python you want to use in your venv. It must already be available somewhere on your system to create a venv using it.
Then instead of just python -m venv .venv you specify which python with the full path : /path/to/pythonX.Y -m venv .venv
You can't have a venv that shares multiple versions of python, to my knowledge at least.
I am working on a project through PyCharm. When I started the project, the project interpreter was a newly created virtualenv located in my project folder at /path/to/project_folder/venv and using base interpreter /usr/bin/python3.6.
When working in PyCharm, the Python Console seems to be using the right venv/Python executable etc. Running os.system("which python") returns /usr/bin/python.
Next, I activate this venv through my terminal (on Ubuntu 18.04) using the command source /path/to/project_folder/venv/bin/activate which works fine and shows me that it is activated with a (venv). However, if I run which python, it returns /home/user/anaconda3/bin/python.
Why is this occurring? How can I access the same Python interpreter from the PyCharm console through my Ubuntu terminal?
Same happened to me in a specific project.
Symptoms:
No executable taken from the venv; i.e:
which python3 from bash is not taken from venv
Python packages are not working from venv
Cause:
You renamed your project folder
Virtual environment PATH keeps old path to venv
It fails silently
Solutions:
Create a new venv and reinstall requirements, OR
Rename folder to its old name
Change PATH is not the solution. venv script creates some other routes in various files.
Note: Tested with python3 -m venv venv
In my company I have a setup where I have an original canopy distribution installed. Through some batch process a virtual environment is then created of that which contains additional python packages.
The virtual environment works fine from pycharm, however, I have the following problems:
When starting pip or python from the command line, the original canopy installation seems to be started. Am I right in thinking that 'activating' the virtual environment simply means adjusting the path variables to folders of the virtual environment? How is this best done automatically? Does canopy or python provide a good script? I want pip to install packages to the virtual environment, which it currently doesn't.
What is the best way to create a new virtual environment based on the virtual environment I already have?
I know that with anaconda this would all be easier, but my solution needs to be based on pure python or canopy.
Not sure about your specific environment, but for python projects, I usually get by with
pip freeze > requirements.txt
to save the list of packages installed in a virtual environment to a file
and
pip install -r requirements.txt
to restore the packages on a new virtual environment.
I've used requirements.txt as the filename, but you can pretty much use any file name you want for this.