how to visualize the python venv name in MacOs zsh prompt - python

I am just starting to learn django and I am facing the set-up phase. In particular I'd like to ask how to recognize if the virtual environment is activated or not. I know that I can use the command pip freeze but in all the tutorial that I am following, when the venv is activated, I can see the venv name in brackets in the terminal command line.
I can correctly activate the venv with the source command and check via the pip freeze command but I have no indication in the command line.
I am on a Mac/OS(M1) and using python3
thank you


To have visual information about the virtualenv on the command line you need to change the shell config to show it. It's not related to python or django itself.
It will depend on the shell that you are using, but assuming the default shell on mac you can check this question virtualenv name not show in zsh prompt


From venv docs.
When a virtual environment is active, the VIRTUAL_ENV environment variable is set to the path of the virtual environment. This can be used to check if one is running inside a virtual environment.
So you should be able to test it with:
import os
os.getenv('VIRTUAL_ENV') is not None


Yes, when the virtual environment is activated, it shows in the terminal as a prefix like
(env) yourname~Desktop/workspace-folder>
And that is enough to know it is activated, and you are using it.
Since you are using Python 3, you can create your virtual environment as follows in the same directory of your project, open terminal or iTerm and run this comman
python3 -m venv env
After few seconds, a folder env will be created that is your virtual environment. Note you can name your virtual environment as you wish, maybe like python3 -m venv djang-app
After you have created the virtual environment, you can now activate it like
source env/bin/activate
Again, if you created your virtual environment using lets say django-app
python3 -m venv django-app
You can activate it like this
source django-app/bin/activate
and you will see your terminal is prefixed as follows
(django-app) yourname~Desktop/workspace-folder>
To deactivate the virtual environment, you simply run this command deactivate in the terminal with active virtual environment.
You can learn more about python3 venv from here.

Related

Python virtual env not activating

For reference, I'm on Windows 11 using the Bash shell and have Python 3.9.2 installed.
I'm trying to create and activate a Python virtual environment using venv but when I activate it, nothing happens, but no error is given either. My understanding is that once I activate it, my prompt should change to reflect the environment I'm working in, and where python should show it in the virtual environment. Can anyone help clear this up for me?

Bash is unlike the normal command line interfaces on Windows. It uses the shell language, hence you'll not be able to activate it using the same procedure.
Since you generated the file from Windows,
to activate the virtual environment, run:
cd example_venv/Scripts
. activate
Take note of the space after the dot. It's very important for it to be included.
For those using Mac OS or Linux, you can just run:
source <path_to_venv>/bin/activate
where <path_to_venv> is the location of your virtual environment.

Unable to Activate My Virtual Environment Because Activate File Not Showing Up

So I installed venv for python and made a virtual environment called ftai_venv. However when I activate it I get an error
When I go into ftai_venv/bin, I don't see the activate bash file. Where would I get this?

The file should be there have you tried creating another virtual environment ?

Run below commands to create the virtual environment
On macOS and Linux:
python3 -m venv ftai_venv
source ftai_venv/bin/activate
for more detail check the link

when should python3 object created in venv?

python newbie here.
I am on a windows machine and used Windows Subsystem for Linux(WSL) to execute commands.
I created my venv(folder) by entering:
python3 -m venv venv
and it would give me a new venv folder as below:
and then activated the virtual environment using:
source venv/bin/activate
however, I am having an issue as I executed another command and it is looking for python3 which should be present as in this path: venv/bin/python3
I am curious how should python3 created in venv. Thanks!

i guess you are confused about the Python virtual environment
first, the virtual environment is designed to establish a command execution environment for each project。
then. the first your code python3 -m venv venv call the system python command and the python3 should in /usr/bin/python3 and linked with /usr/bin/python3.x
but, if you activate the virtual environment of Python, the virtualenv will and the {you_dir}/venv/bin to the system path and you will call python through /venv/bin/python
to execute you python code.
there is no need create an link of /ven/bin/python3. but if you want, you can do it!

When does venv need activation?

When using Pycharm, I make my virtual environment when I m creating a new project and then never have to think about activating it or anything. It works just fine.
When I m using the terminal on my Mac OS, I need to create the virtual environment and then also activate it.
I also have to activate it for VS Code.
How do I know when I need to activate my virtual environment? Thanks.

To activate a virtual environment from the terminal, you need to source a file that the venv module created. This file typically will be in the bin directory of your project (ej. my_project/folder/bin) and will be named activate.
So to activate the environment in your shell you would run the command
source my_project/folder/bin/activate
You should know if you're already IN the virtual environment, when you see the project's name parsed to some part of your shell prompt. If you're already into your virtual environment, you can leave it with the deactivate command.

How to activate virtual environment from Windows 10 command prompt

I'm trying to create and activate a virtual environment, using Windows 10 command prompt. I know that virtualenv is installed correctly, as the command
virtualenv venv
Works. I've navigated to my virtualenv download, Downloads\venv\Scripts, and am trying to activate my virtual environment venv. I've tried
venv activate
Which doesn't work since Windows doesn't recognize venv as a command. I've also tried
virtualenv venv activate
Which also doesn't work since virtualenv is saying that "venv activate" isn't a valid argument.

Use the activate script in the Scripts directory of your virtual environment:
> venv\Scripts\activate
This will activate your virtual environment and your terminal will look like this depending on the directory you're in:
(venv) C:\Users\acer\Desktop>
I hope this helps!

If you're using virtualenvwrapper-win, and using the DOS command prompt (as opposed to e.g. Powershell), then new virtualenvs are created using:
mkvirtualenv myenv
and activated using
workon myenv
You should define the environment variable WORKON_HOME to point to where you want you virtualenvs to reside.
If you've installed virtualenvwrapper-win>=1.2.4 then the virtualenvwrapper command will give you a list available commands:
go|c:\srv> virtualenvwrapper
virtualenvwrapper is a set of extensions to Ian Bicking's virtualenv
tool. The extensions include wrappers for creating and deleting
virtual environments and otherwise managing your development workflow,
making it easier to work on more than one project at a time without
introducing conflicts in their dependencies.
virtualenvwrapper-win is a port of Dough Hellman's virtualenvwrapper to Windows
batch scripts.
Commands available:
add2virtualenv: add directory to the import path
cdproject: change directory to the active project
cdsitepackages: change to the site-packages directory
cdvirtualenv: change to the $VIRTUAL_ENV directory
lssitepackages: list contents of the site-packages directory
lsvirtualenv: list virtualenvs
mkproject: create a new project directory and its associated virtualenv
mkvirtualenv: Create a new virtualenv in $WORKON_HOME
rmvirtualenv: Remove a virtualenv
setprojectdir: associate a project directory with a virtualenv
toggleglobalsitepackages: turn access to global site-packages on/off
virtualenvwrapper: show this help message
whereis: return full path to executable on path.
workon: list or change working virtualenvs

From the directory where you have your virtual environment (e.g. myenv)
you need to run the following command: .\myenv\Scripts\activate

Go to the folder where you have created the virtual environment in cmd and
enter the command .\venv\Scripts\activate
It will activate the virtual env in windows

from the command (cmd) prompt:
call venv/Scripts/activate

Make sure the Python Scripts folder is in your environment variables.
Usually the path is: "C:\Users\admin\AppData\Local\Programs\Python\Python37-32\Scripts"
(Change "admin" to your windows username and "Python37-32" path according to your python version)

When you use "virtualenv" to create an env, it saves an "activate.bat" file in the scripts folder originating from the directory you ran the first command. E.g if you ran the command virtualenv env from C:/Users/Name/Documents/..., the .bat will be located in C:/Users/Name/Documents/.../env/scripts/activate.bat. You can run it from there.

Simply you can activate your virtualenv using command: workon myenvname

You can also create a command-line script like this -
#echo off
CD\
CD "C:\Users\[user name]\venv\Scripts"
start activate.bat
start jupyter notebook
Save this in a notepad file with an extension ".cmd".
You are ready to go

if you have anaconda installed then open anaconda terminal and type
> conda env list # for list of environment you already have
> conda activate {env_name} # to activate the environment

This works for me from Anaconda prompt,
.\\myvenv\\Scripts\\activate.bat

start python 3.7
python -m virtualenv
"You must provide a DEST_DIR"
python -m venv demodjango("demodjango is file name)"
activate.bat
pip install django
django-admin.py startproject demo1 (demo1 is my project)
python manage.py runserver
Performing system checks...
After doing this on a command prompt, you will get an URL. Click on that and you will see a message in the browser window that Django has been properly installed.

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