I have this bug too. Did some digging, the error message is wrong due
to over-zealous assumptions.
In /usr/lib/python3.6/venv/__init__.py:
def _setup_pip(self, context):
"""Installs or upgrades pip in a virtual environment"""
# We run ensurepip in isolated mode to avoid side effects from
# environment vars, the current directory and anything else
# intended for the global Python environment
cmd = [context.env_exe, '-Im', 'ensurepip', '--upgrade',
'--default-pip']
# Debian 2015-09-18 ba...@debian.org: <python>-venv is a
separate
# binary package which might not be installed. In that case,
the
# following command will produce an unhelpful error. Let's
make it
# more user friendly.
try:
subprocess.check_output(
cmd, stderr=subprocess.STDOUT,
universal_newlines=True)
except subprocess.CalledProcessError:
print(...)
So any failure in the command will invoke the error message.
Trying to call the command line given by the `cmd` variable directly
gets me this:
Traceback (most recent call last):
File "/usr/lib/python3.6/runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "/usr/lib/python3.6/runpy.py", line 85, in _run_code
exec(code, run_globals)
File "/usr/lib/python3.6/ensurepip/__main__.py", line 5, in <module>
sys.exit(ensurepip._main())
File "/usr/lib/python3.6/ensurepip/__init__.py", line 264, in _main
default_pip=args.default_pip,
File "/usr/lib/python3.6/ensurepip/__init__.py", line 176, in
_bootstrap
return _run_pip(args + _PROJECTS, additional_paths)
File "/usr/lib/python3.6/ensurepip/__init__.py", line 54, in _run_pip
import pip._internal
ModuleNotFoundError: No module named 'pip._internal'
Looking at /usr/lib/python3.6/ensurepip/__init__.py we see:
def _run_pip(args, additional_paths=None):
# Add our bundled software to the sys.path so we can import it
if additional_paths is not None:
sys.path = additional_paths + sys.path
# Install the bundled software
import pip._internal
return pip._internal.main(args)
Rummaging through /usr/lib/python3/dist-packages/pip/ I don't find an
`_internal` package but I do find a `pip.main()` method, so I just
change the `_run_pip()` function to call that:
def _run_pip(args, additional_paths=None):
# Add our bundled
software to the sys.path so we can import it
if additional_paths is
not None:
sys.path = additional_paths + sys.path
# Install the bundled software
import pip
return pip.main(args)
And everything APPEARS to work with this ugly hack.
Love,
Simon
