Fact is I have already installed django.
Now I want to install flask. But have no idea how to install virtual environment again in separate directory.
Navigate to the directory where you want your new virtual environment and type:
virtualenv venv
Virutalenv documentation here.
Related
I have been through numerous similar questions and I still don't understand how are we activating virtual environment for Django projects. Please mention explanation for how each command works and one more questions is that why do we not need to install python in Django's virtual environment, I am getting confused. Thank you in advance, please help this newbie.
Benefits
You can use any version of python you want for a specific environment
without having to worry about collisions (shoutout to my python 2.7
mac users!)
You can organize your packages much better and know exactly the
packages you need to run your code incase someone else needs to run
it on their machine
Your main python package directory does not get FLOODED with
unnecessary python packages
To create virtual environment
step 1 install environment package (virtualenv) using pip
pip install virtualenv
step 2 create virtualenv
virtualenv env_name #<- env_name is virtualenv name you can set any
step 3 Activate Virtual env
env_name\Scripts\activate #<- for window
step 4 Install pakages you wan to install in virtual env
cmd(env_name): pip install django
Note that python is install in your virtual env automaticaty the
version is same as in your local machine
There is no difference between activating virtual environment for Django or for other purposes. Django on it's own does not differ from any Python library out there.
Python virtual environment allows you to separate your system Python and it's libraries and create self-contained directory tree that contains a Python installation for a particular version of Python, plus a number of additional packages.
On Linux, assuming you already have Python 3 and pip3 installed:
# install virtualenv package (skip if you have it already)
pip3 install virtualenv
# create virtual environment in directory "tutorial-env"
python3 -m venv tutorial-env
# activate virtual environment
source tutorial-env/bin/activate
Upon activation below command should give path to new Python binary:
which python3
Similarly with pip3
which pip3
As long as your environment is activate you can run pip3 install $package_name and it will install it inside virtual environment.
To deactivate your virtual environment:
deactivate
For more info and commands for Windows:
https://packaging.python.org/en/latest/guides/installing-using-pip-and-virtual-environments/
https://docs.python.org/3/tutorial/venv.html
ERROR:: --system is intended to be used for pre-existing Pipfile installation, not installation of specific packages. Aborting.
I can't use pipenv in Ubuntu18.04.
How can I fix it?
This is an open issue in the Pipenv repository: https://github.com/pypa/pipenv/issues/5052.
From the discussion in the thread, it seems to pop up when there is an existing virtualenv that was created with the same directory path. The solution mentioned in the thread is to simply remove this virtualenv which fixes the issue.
You can use the python virtual environment,
python -m venv venv # Creates virtual environment
To activate virtual environment do source venv/bin/activate
Then you can install your packages using pip install lib
To deactivate virtual environment type deactivate
I was trying to install the Adafruit_Python_MPR121 Library in my venv folder, but it always installed it into the global dist-packages and I cannot access them from my venv.
I cannot use --site-packages because I need some local packages in the env.
Does someone know a solution for it?
I'm sure you can and should use --site-packages. It doesn't do what you seem to think it does — it doesn't make pip install all packages globally. It makes python in the virtual env access global site-packages but pip still install packages in the virtual env (after you activate it with . env/bin/activate).
I have activated the python virtual environment, but anyway when I run pip install *, the dependencies are installed to my local Python path. The same happens when I run the server in my Django project: python manage.py runserver -> the system is not using the virtual environment, but the python from my PC. What is the problem? Why my activated virtual environment does not work?
I am using MacOS. Everything worked until I erased all my data and installed again Python.
Thank you!
If the packages aren't getting installed within your virtual environment, it most likely is the case that you are not using the pip within your virtual environment (or may not have pip within your virtual environment at all, in which case it is defaulting to use the pip installed in /usr/local/bin/). First, check that you have a separate version of pip in your virtual environment located in ./your_virtual_environment_name/bin/pip....If you don't, install from the PyPA download page (https://pip.pypa.io/en/stable/installing/#installing-with-get-pip-py). When you go to install a package within your virtual environment, activate the virtual environment first using source ./bin/activate inside your virtual environment, then "cd .." and you'll use the pip installed within the virtual environment by typing: ./your_virtual_environment_name/bin/pip install * ....The installation will be in ./your_virtual_environment_name/lib/python3.6/site-packages/
I want to do some experiments with tensorflow in virtualenv. I followed the tutorial and install tensorflow and virtualenv. Everything works well. However, when I try to use matplotlib.pylot. It said I need framework. So I follow the [solution][1] https://matplotlib.org/faq/osx_framework.html. It said "If you are on Python 3, use venv instead of virtualenv"
python -m venv my-virtualenv
source my-virtualenv/bin/activate
Then I activate the virtual Environments, but all the module that I install in virtualenv cannot find. I think I just use venv, but not use virtualenv. Now I want to use virtualenv, and don't want to use venv any more. I even try to delete venv, but it seems it doesn't work. What should I do? How do I what virtual environments I am using? Thank you.
You've to install packages inside the virtual environment for them to be available to used when the virtual environment is activated. So, install the packages after activating the environment!