I have created a requirement file from a virtual environment in my laptop machine,
when i want to use it and install package in another machine in create virtual environment , I give an error about cant have a such directory file(in general)
how can i solve this error in general environment(use different version in different environment?
On your second machine (Where you want to install requirements.txt)
Install virtual environment package using this command:
pip install virtualenv
Create a virtual environment:
virtualenv venv
Note: The above command will create virtual environment in your current directory with folder named "venv" (You can use any name).
Activate your virtual environment:
Linux/Mac: source venv/bin/activate
Windows: venv\bin\activate
Install requirements.txt
pip install -r /path/to/requirements.txt
Related
I already started a python project and I found out about using virtual environments and how it is a good practice. I installed virtualenv and created a new environment. But, my existing project is still running on the default python i.e with global modules and everything. How do you get the project files to run on the virtual environment? I am using VS Code and python 3.10.1
you will have to activate the virtual env and then reinstall all the required packages in the virtual env
You can activate your virtual environment by saying;
source venv/bin/activate
then pip the required packages for your project
pip install package_name
You can see all the packages you have installed with pip freeze
To keep the modules and versions you have installed in a file called requirements.txt;
pip freeze > requirements.txt
You can now install these packages to the environment and project you want with a single command. pip install -r requirements.txt
I try to install a package with pip in a virtual environement previously created with venv. The Python version is managed through pyenv. I don't want to use pyenv to create the virtual environment.
The project is set up this way. To the project empty directory, I added a .python-version containing the version 3.8.2. Then I created my virtual environement using python -m venv .venv. Then I activated the environement using source .venv/bin/activate. Now the command line starts with a (.env). However, when I try to install some package with pip install some-package, the package ends up in {pyen_home}/versions/3.8.2/lib/python3.8/site-packages, instead of the virtual environment.
What's irritating is that I'm almost certain that I did manage to install package in the virtual environment that way before, but not anymore, so I don't see what I'm missing.
Content of your .python-version should be .venv.
As far as I know you should not create this file by yourself. It generated when you run pyenv local .venv. And venv activates automatically.
Also proper way to create virtual environment is pyenv virtualenv {python-version} {venv-name}. Read the docs carefully.
I am trying to create a virtual environment to run a script which requires Python 3.6. I started off with Pipenv but I am unable to create the same environment on other platforms via the Pipfile.lock or requirements.txt unless the other platform(s) has Python 3.6 installed. I have read this post but I am unsure which direction I should take to create a virtual environment which can be shared and run its own version of Python independent of operating system and version of Python installed on the other platform.
Virtual environments are not portable, they depend on the Python installation you have.
You can't share/distribute virtual environment with others, because you can't control which version of Python others are using.
If you want to distribute your code along with all dependencies including the specific version of Python interpreter, you can use PyInstaller. It is far from perfect and little bit hacky. Also it generates a package which is specific to operating system.
https://pyinstaller.readthedocs.io/en/stable/operating-mode.html
There is also a detailed step-by-step guide on how to use PyInstaller.
https://realpython.com/pyinstaller-python/
This is step-by-step how I use Python virtual environment and share it with co-workers.
To check python and virtualenv presence, run following commands:
which python3
python3 -m pip list | grep env
which virtualenv
Install a python virtual environment builder:
python3 -m pip install virtualenv
Create a virtual environment named venv inside the project's directory: virtualenv venv
To activate this environment use this command inside project's directory: source venv/bin/activate
Install python modules dependencies listed in a requirements.txt:
python3 -m pip install -r requirements.txt
You should activate virtual environment when you working with python in this directory for package installation and for running commands in the project directory. When you need to deactivate the virtual environment do it using deactivate command.
To deactivate environment simply run: deactivate
So am working in a group project, we are using python and of the code is on GitHub. My question is how do I activate the virtual environment? Do I make one on my own using the "python virtual -m venv env" or the one that's on the repo, if there is such a thing. Thanks
virtual env is used to make your original env clean. you can pip install virtualenv and then create a virtual env like virtualenv /path/to/folder then use source /path/to/folder/bin/activate to activate the env. then you can do pip install -r requirements.txt to install dependencies into the env. then everything will be installed into /path/to/folder/lib
alteratively, you can use /path/to/folder/bin/pip install or /path/to/folder/bin/python without activating the env.
Yes, you'll want to create your own with something like: python -m venv venv. The final argument specifies where your environment will live; you could put it anywhere you like. I often have a venv folder in Python projects, and just .gitignore it.
After you have the environment, you can activate it. On Linux: source venv/bin/activate. Once activated, any packages you install will go into it; you can run pip install -r requirements.txt for instance.
I had created a project in pycharm using virtualenv environment.
My current location is
(venv) C:\Users\username\Documents\pycode\MyProj1>
Now I am running pip install flask and it is downloading packages in the global environment,i.e., C:\Users\username\AppData\Local\Programs\Python\Python36-32\Lib\site-packages instead of my virtual environment.
I can install packages in the virtual environment only when I go to project interpreter in settings and then adding flask.
Can anyone tell how can I install packages in virtual environment by using pip?
In your Command Prompt enter:
pip install virtualenv
Launch virtualenv
In your Command Prompt navigate to your project:
cd your_project
Within your project:
virtualenv env
Activate your virtualenv:
on Windows, virtualenv creates a batch file
\env\Scripts\activate.bat
to activate virtualenv on Windows, activate script is in the Scripts folder :
\path\to\env\Scripts\activate
Example:
C:\Users\'Username'\venv\Scripts\activate.bat