Some more info:
Inserting a 'print(cmd)' at line 259 showed that the direct cause of
the error message is the command:
['/home/flo/python-venv/testdir/bin/python3.5',
'-Im', 'ensurepip', '--upgrade', '--default-pip']
exiting with a non-zero exit status. Running this command by hand after
the venv creation failed yields:
~/python-venv % /home/flo/python-venv/testdir/bin/python3.5 -Im ensurepip
--upgrade --default-pip; echo $?
Traceback (most recent call last):
File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main
"__main__", mod_spec)
File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/usr/lib/python3.5/ensurepip/__main__.py", line 4, in <module>
ensurepip._main()
File "/usr/lib/python3.5/ensurepip/__init__.py", line 218, in _main
version="pip {}".format(version()),
File "/usr/lib/python3.5/ensurepip/__init__.py", line 74, in version
assert len(wheel_names) == 1, wheel_names
AssertionError: []
1
~/python-venv %
The assertion error comes from this in
/usr/lib/python3.5/ensurepip/__init__.py:
wheel_names = glob.glob('/usr/share/python-wheels/pip-*.whl')
assert len(wheel_names) == 1, wheel_names
and indeed:
~/python-venv % ls /usr/share/python-wheels/pip-*.whl
zsh: no matches found: /usr/share/python-wheels/pip-*.whl
~/python-venv % apt-file search /usr/share/python-wheels/pip-
virtualenv: /usr/share/python-wheels/pip-8.0.2-py2.py3-none-any.whl
~/python-venv %
I then installed the 'virtualenv' package, which does provide the
mentioned file, and tried to recreate the venv from scratch after adding
a 'print(os.getcwd())' right after the previously-added 'print(cmd)' in
/usr/lib/python3.5/venv/__init__.py (lines 259-260, before the 'try'
statement in EnvBuilder._setup_pip()):
~/python-venv % rm -rf testdir
~/python-venv % /usr/bin/python3.5 -m venv testdir
['/home/flo/python-venv/testdir/bin/python3.5', '-Im', 'ensurepip',
'--upgrade', '--default-pip']
/home/flo/python-venv
The virtual environment was not created successfully because ensurepip is not
available. On Debian/Ubuntu systems, you need to install the python3-venv
package using the following command.
apt-get install python3-venv
You may need to use sudo with that command. After installing the python3-venv
package, recreate your virtual environment.
~/python-venv % /usr/bin/python3.5 -c "import subprocess;
subprocess.check_output(['/home/flo/python-venv/testdir/bin/python3.5', '-Im',
'ensurepip', '--upgrade', '--default-pip'])"
Traceback (most recent call last):
File
"/tmp/tmpicb907db/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/__init__.py", line
33, in vendored
ImportError: No module named 'pip._vendor.cachecontrol'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3.5/runpy.py", line 184, in _run_module_as_main
"__main__", mod_spec)
File "/usr/lib/python3.5/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/usr/lib/python3.5/ensurepip/__main__.py", line 4, in <module>
ensurepip._main()
File "/usr/lib/python3.5/ensurepip/__init__.py", line 269, in _main
default_pip=args.default_pip,
File "/usr/lib/python3.5/ensurepip/__init__.py", line 175, in bootstrap
_run_pip(args + _PROJECTS, additional_paths)
File "/usr/lib/python3.5/ensurepip/__init__.py", line 65, in _run_pip
import pip
File "/tmp/tmpicb907db/pip-8.0.2-py2.py3-none-any.whl/pip/__init__.py", line
12, in <module>
File "/tmp/tmpicb907db/pip-8.0.2-py2.py3-none-any.whl/pip/exceptions.py",
line 6, in <module>
File
"/tmp/tmpicb907db/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/__init__.py", line
52, in <module>
File
"/tmp/tmpicb907db/pip-8.0.2-py2.py3-none-any.whl/pip/_vendor/__init__.py", line
35, in vendored
ImportError: No module named 'cachecontrol'
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3.5/subprocess.py", line 626, in check_output
**kwargs).stdout
File "/usr/lib/python3.5/subprocess.py", line 708, in run
output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command
'['/home/flo/python-venv/testdir/bin/python3.5', '-Im', 'ensurepip',
'--upgrade', '--default-pip']' returned non-zero exit status 1
~/python-venv %
--
Florent
