zyga@fx:/tmp$ virtualenv -p python3 dupa
Already using interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in dupa/bin/python3
Also creating executable in dupa/bin/python
Installing setuptools, pip...
  Complete output from command /tmp/dupa/bin/python3 -c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip:
  Ignoring indexes: https://pypi.python.org/simple/
Downloading/unpacking setuptools
Cleaning up...
Exception:
Traceback (most recent call last):
  File "/usr/share/python-wheels/pip-1.5.6-py2.py3-none-any.whl/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/share/python-wheels/pip-1.5.6-py2.py3-none-any.whl/pip/commands/install.py", line 304, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/share/python-wheels/pip-1.5.6-py2.py3-none-any.whl/pip/req.py", line 1178, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/usr/share/python-wheels/pip-1.5.6-py2.py3-none-any.whl/pip/index.py", line 292, in find_requirement
    elif is_prerelease(version) and not (self.allow_all_prereleases or req.prereleases):
  File "/usr/share/python-wheels/pip-1.5.6-py2.py3-none-any.whl/pip/util.py", line 739, in is_prerelease
    return any([any([y in set(["a", "b", "c", "rc", "dev"]) for y in x]) for x in parsed])
  File "/usr/share/python-wheels/pip-1.5.6-py2.py3-none-any.whl/pip/util.py", line 739, in <listcomp>
    return any([any([y in set(["a", "b", "c", "rc", "dev"]) for y in x]) for x in parsed])
TypeError: 'int' object is not iterable

Storing debug log for failure in /home/zyga/.pip/pip.log
----------------------------------------
...Installing setuptools, pip...done.
Traceback (most recent call last):
  File "/usr/bin/virtualenv", line 9, in <module>
    load_entry_point('virtualenv==1.11.6', 'console_scripts', 'virtualenv')()
  File "/usr/lib/python3/dist-packages/virtualenv.py", line 830, in main
    symlink=options.symlink)
  File "/usr/lib/python3/dist-packages/virtualenv.py", line 1032, in create_environment
    install_wheel(to_install, py_executable, search_dirs)
  File "/usr/lib/python3/dist-packages/virtualenv.py", line 975, in install_wheel
    'PIP_NO_INDEX': '1'
  File "/usr/lib/python3/dist-packages/virtualenv.py", line 917, in call_subprocess
    % (cmd_desc, proc.returncode))
OSError: Command /tmp/dupa/bin/python3 -c "import sys, pip; sys...d\"] + sys.argv[1:]))" setuptools pip failed with error code 2