Python virtualenv ImportError：没有名为_vendor的模块

Question

I installed virtualenv on my system but when I want to actually create a virtual environment I get the following error:

...
Successfully installed virtualenv-15.0.3
$ virtualenv venv
New python executable in /Users/.../venv/bin/python
Installing setuptools, pip, wheel...
  Complete output from command /Users/.../venv/bin/python - setuptools pip wheel:
  Traceback (most recent call last):
  File "<stdin>", line 9, in <module>
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py", line 578, in get_data
    loader = get_loader(package)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py", line 464, in get_loader
    return find_loader(fullname)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py", line 474, in find_loader
    for importer in iter_importers(fullname):
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pkgutil.py", line 430, in iter_importers
    __import__(pkg)
ImportError: No module named _vendor
----------------------------------------
...Installing setuptools, pip, wheel...done.
Traceback (most recent call last):
  File "/usr/local/bin/virtualenv", line 11, in <module>
    sys.exit(main())
  File "/Library/Python/2.7/site-packages/virtualenv.py", line 711, in main
    symlink=options.symlink)
  File "/Library/Python/2.7/site-packages/virtualenv.py", line 944, in create_environment
    download=download,
  File "/Library/Python/2.7/site-packages/virtualenv.py", line 900, in install_wheel
    call_subprocess(cmd, show_stdout=False, extra_env=env, stdin=SCRIPT)
  File "/Library/Python/2.7/site-packages/virtualenv.py", line 795, in call_subprocess
    % (cmd_desc, proc.returncode))
OSError: Command /Users/.../venv/bin/python - setuptools pip wheel failed with error code 1

Any suggestions why this fails?

Answer 1

This seems to be a problem with pip in combination with the native OS X version of Python. I downloaded python from https://www.python.org/ and was able to install pip and virtualenv properly.