setting up environment in virtaulenv using python3

问题:

Running the following:

virtualenv -p python3 venv

gives:

Running virtualenv with interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in /specific/a/home/cc/students/csguests/taivanbatb/venv/bin/python3
Also creating executable in /specific/a/home/cc/students/csguests/taivanbatb/venv/bin/python
Installing setuptools, pip, wheel...

which is where it gets stuck.

Calling CTRL-C gives:

  File "/usr/local/bin/virtualenv", line 11, in <module>
    sys.exit(main())
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 671, in main
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 2328, in <module>
    raise SystemExit(popen.wait())
  File "/usr/lib/python2.7/subprocess.py", line 1376, in wait
    pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0)
  File "/usr/lib/python2.7/subprocess.py", line 476, in _eintr_retry_call
    return func(*args)
KeyboardInterrupt
    main()
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 713, in main
    symlink=options.symlink)
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 945, in create_environment
    download=download,
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 901, in install_wheel
    call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)
  File "/usr/local/lib/python2.7/dist-packages/virtualenv.py", line 769, in call_subprocess
    line = stdout.readline()
KeyboardInterrupt

Similar to this.

As suggested in the linked question, I tried installing with --no-wheel but to no avail. And I am sure it is not a network connectivity problem because setting up an environment using python2 using virtualenv env gives no errors.

The specific versions of all the packages I am using are as follows:

python 3.4.0 python 2.7.6 virtualenv 15.1.0

回答1:

1.Check your internet connections.

2.Set python3 as your default python interpreter since you have python2.7 as your default python interpreter. Try using without any wheel by:

virtualenv venv --no-wheel

Then activate virtualenv and run:-

pip install --upgrade pip
pip install setuptools --no-use-wheel --upgrade
pip install wheel --no-cache 

If you are behind proxy then use:-
sudo pip download setuptools pip wheel --proxy http://<yourproxyhere>

After all this virtualenv -p python3 venv is working in my virtualenv perfectly.
NOTE: Assuming virtual environment is already set in your system and python3 is your default interpreter.

Alternatively, you don't need to do virtualenv -p python3 venv. You can specify python interpreter(present in /usr/bin/* folder) which you want to use in virtualenv and use it like this:-
virtualenv --python=/usr/bin/pythonX.Y /home/username/path/to/virtualenv_name

if you want to install in the current working directory then you can use:-
virtualenv --python=/usr/bin/pythonX.Y virtualenv_name
REFERENCE

回答2:

Your stack trace indicates you are using virtualenv from your 2.7 installation. This would indicate that your PATH is not set for 3.x. Start a new shell, set the PATH so that /usr/local/lib/python2.7 is not on it, and try again.

回答3:

virtualenv is a just a python package. And you can install it both on python2 and python3.

In my experience, virtualenv on python3 handles both python versions well. Your stacktrace shows that you use virtualenv for python2 - try switching to python3.

To install it on python3, run

pip3 install virtualenv

or, if you have to use apt-get for some reason,

apt-get install python3-virtualenv