Creating virtualenv with python3

Question

I generally use python2.7 for projects.

For one project, I need to use python 3.5+.

I installed python3 on Mac.

Also installed virtualenv using pip3.

Now when I run the command

virtualenv -p python3 test

I get the following error:

Running virtualenv with interpreter /usr/bin/python3
Already using interpreter /Library/Developer/CommandLineTools/usr/bin/python3
Using base prefix '/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7'
New python executable in /Users/sourabh/virtualenvs/test/bin/python3
Also creating executable in /Users/sourabh/virtualenvs/test/bin/python
Traceback (most recent call last):
 File "/Library/Python/3.7/site-packages/virtualenv.py", line 2632, in <module>
 main()
 File "/Library/Python/3.7/site-packages/virtualenv.py", line 870, in main
 symlink=options.symlink,
 File "/Library/Python/3.7/site-packages/virtualenv.py", line 1156, in create_environment
 install_python(home_dir, lib_dir, inc_dir, bin_dir, site_packages=site_packages, clear=clear, symlink=symlink)
 File "/Library/Python/3.7/site-packages/virtualenv.py", line 1621, in install_python
 shutil.copy(original_python, py_executable)
 File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/shutil.py", line 245, in copy
 copyfile(src, dst, follow_symlinks=follow_symlinks)
 File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/shutil.py", line 103, in copyfile
 if _samefile(src, dst):
 File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/shutil.py", line 88, in _samefile
 return os.path.samefile(src, dst)
 File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/genericpath.py", line 96, in samefile
 s1 = os.stat(f1)
TypeError: stat: path should be string, bytes, os.PathLike or integer, not NoneType

• Trollsors: I think for mac it is "virtualenv yourenvname -p python3.6"
• Kent Martin: Check version of pip3 and update, then update virtualenv. This is an old issue that should be resolved
• frankie567: Also, to avoid headaches, I would recommend you to take a look at pyenv. It helps you manage several versions of Python on the same system. You can for example make Python 3.x by default instead of the antique 2.7 of macOS.
• ubik: I confirm what @KentMartin said. Upgrading virtualenv works.

Answer 1

For making a virtual environment with Python 3

Use this for making env

python3 -m venv env

To activate env

source env/bin/activate

Answer 2

Improve upon answer of @ParthS007 (Wanted to add a comment to the existing answer but couldn't due to not enough reputation):

1. Corrected the virtual environment name to be the common used one venv so it's easier for beginners like me to use/understand in conjunction with other tutorials.
2. Added how to deactivate and remove virtual environment too.

For making a virtual environment with Python 3

Use this for making env

python3 -m venv venv

To activate env

source env/bin/activate

To deactivate env

deactivate

To remove env

rm -rf venv