py33 environment uses python2.7

Issue #129 on hold
Jorgen Schäfer created an issue

I'm using tox in a pretty simple setup, and can't get it to run with the py33 environment. It is quite likely that this is a bad setup on my local system, but I can't figure out why it is doing what it is doing.

$ cat 
#!/usr/bin/env python

from setuptools import setup, find_packages


$ cat tox.ini
envlist = py33

commands = ls

$ tox
GLOB sdist-make: /tmp/tox-test/
py33 create: /tmp/tox-test/.tox/py33
ERROR: invocation failed, logfile: /tmp/tox-test/.tox/py33/log/py33-0.log
ERROR: actionid=py33
cmdargs=['/home/forcer/bin/python3.3', '/home/forcer/.local/lib/python2.7/site-packages/', '--setuptools', '--python', '/home/forcer/bin/python3.3', 'py33']
Already using interpreter /home/forcer/bin/python3.3
Traceback (most recent call last):
  File "/home/forcer/.local/lib/python2.7/site-packages/", line 2308, in <module>
  File "/home/forcer/.local/lib/python2.7/site-packages/", line 821, in main
  File "/home/forcer/.local/lib/python2.7/site-packages/", line 952, in create_environment
    home_dir, lib_dir, inc_dir, bin_dir = path_locations(home_dir)
  File "/home/forcer/.local/lib/python2.7/site-packages/", line 1017, in path_locations
    inc_dir = join(home_dir, 'include', stdout.strip(), py_version + abiflags)
  File "/home/forcer/Programs/Python/python3.3/lib/python3.3/", line 92, in join
    "components.") from None
TypeError: Can't mix strings and bytes in path components.
ERROR: InvocationError: /home/forcer/bin/python3.3 /home/forcer/.local/lib/python2.7/site-packages/ --setuptools --python /home/forcer/bin/python3.3 py33 (see /tmp/tox-test/.tox/py33/log/py33-0.log)
___________________________________ summary ____________________________________
ERROR:   py33: InvocationError: /home/forcer/bin/python3.3 /home/forcer/.local/lib/python2.7/site-packages/ --setuptools --python /home/forcer/bin/python3.3 py33 (see /tmp/tox-test/.tox/py33/log/py33-0.log)

I can't figure out why it is using the from python2.7. Shouldn't it be using from python3.3?

Comments (7)

  1. Holger Krekel repo owner

    Using the python2.7 virtualenv is fine, expected behaviour. After all, before creating the py33 env, there is no "virtualenv" installed with python3.3.

    I can't reproduce the problem.

    Could you try to find out which of the join arguments ( line 1017) actually contains bytes?

  2. Jorgen Schäfer reporter

    stdout does:

    {'abiflags': 'm',
     'stdout': b'multiarch-x86_64-linux',
     'py_version': 'python3.3',
     'home_dir': 'py33'}

    Indeed, according to the documentation, if subprocess.Popen is called without universal_newlines, stdin, stdout and stderr are opened as binary streams with no conversion:

    Looks like this only happens when /usr/bin/multiarch-platform exists. I can confirm all works fine if I remove that file; it's installed on this host by the rpmbuild package.

    Edit: … and yes, adding universal_newlines=True also fixes it.

  3. Holger Krekel repo owner

    fix issue129: tox now uses Popen(..., universal_newlines=True) to force creation of unicode stdout/stderr streams. fixes a problem on specific platform configs when creating virtualenvs with Python3.3. Thanks Jorgen Schäfer or investigation and solution sketch.

    → <<cset f8af400bcecc>>

  4. Holger Krekel repo owner

    You can install the dev version with pip install --pre -U -i tox, btw.

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