Setting up and using Python3 Virtualenv on Mac

Python3 Virtualenv Setup.md

Python3 Virtualenv Setup

Requirements

• Python 3
• Pip 3

$ brew install python3

Pip3 is installed with Python3

Installation

To install virtualenv via pip run:

$ pip3 install virtualenv

Usage

Creation of virtualenv:

$ virtualenv -p python3 <desired-path>

Activate the virtualenv:

$ source <desired-path>/bin/activate

Deactivate the virtualenv:

$ deactivate

About Virtualenv

@raitisd: Well, that's the idea.

For some reason, brew recently decided that python refers to python3 instead of python2.
It's a pain in the ass.

Here, I wrote you a little script:

brew uninstall --force --ignore-dependencies python python2 python2.7 python3 python3.6 > /dev/null 2>&1
brew install python@2 python@3 > /dev/null 2>&1
echo; for x in python python2 python3; do 
which $x; readlink $(which $x); $x --version; echo; done

The output should look like this:

/usr/local/bin/python
../Cellar/python@2/2.7.14_3/bin/python
Python 2.7.14

/usr/local/bin/python2
../Cellar/python@2/2.7.14_3/bin/python2
Python 2.7.14

/usr/local/bin/python3
../Cellar/python/3.6.4_4/bin/python3
Python 3.6.4

If it does, it should be fixed.

The copy of python that belongs to the OS still lives here: /usr/bin/python

I was getting this error **
RuntimeError: failed to find interpreter for Builtin discover of python_spec='python3'

AN ERROR OCCURRED

java.lang.IllegalStateException: Creating virtual env exited with 1. Check the logs for more details.
**

I am using MacOS, and python2.7 comes inbuilt. I was facing some issues while installing virtualenv, installed it with pip after some efforts. But now I think the conflict is due to the python versions (2.7 & 3). I do not have Python 3 installed in my system.
So I tried your script @tjt263, but got the below response **

/usr/bin/python
Python 2.7.10

-bash: python2: command not found

-bash: python3: command not found
**

Any idea what could possibly be the issue?

Youre awesomeeeee

Worked like a charm!

Thanks It worked

Just use pip in the venv. https://docs.python.org/3/library/venv.html

if it fails for you in:
virtualenv -p python3 <desired_path>
Try:
python3 -m virtualenv <desired_path>

If i use both of this i get this error
Someone help me rectify it
zsh: parse error near `\n'

Hi, what if my macOS already has python3 and if I installed python3 via brew, its not going to use the brew version. What should I do ? Thanks!

hello all,
I have the same error:

if it fails for you in:
virtualenv -p python3 <desired_path>
Try:
python3 -m virtualenv <desired_path>

If i use both of this i get this error
Someone help me rectify it
zsh: parse error near `\n'

can someone help me please ???

Creation of virtualenv:
python3 -m venv <desired_path>

To create a virtual environment, go to your project’s directory and run venv. If you are using Python 2, replace venv with virtualenv in the below commands.

Got below error after enter: pip3 install virtualenv, how do I resolve this?

Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: virtualenv in /Users/fanyang/Library/Python/3.8/lib/python/site-packages (20.15.1)
Requirement already satisfied: distlib<1,>=0.3.1 in /Users/fanyang/Library/Python/3.8/lib/python/site-packages (from virtualenv) (0.3.4)
Requirement already satisfied: six<2,>=1.9.0 in /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/site-packages (from virtualenv) (1.15.0)
Requirement already satisfied: platformdirs<3,>=2 in /Users/fanyang/Library/Python/3.8/lib/python/site-packages (from virtualenv) (2.5.2)
Requirement already satisfied: filelock<4,>=3.2 in /Users/fanyang/Library/Python/3.8/lib/python/site-packages (from virtualenv) (3.7.1)

if it fails for you in: virtualenv -p python3 <desired_path> Try: python3 -m virtualenv <desired_path>

Thanks so much! Only this command gets worked for my Mac!