poetry install creates venv using compatible version (python3) but tries to install dependencies using pip v2

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macOS Mojave 10.14.6
• Poetry Version: 1.0.0
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/nickperkins/f99285f9ce978f2b561717ae6104d918

Issue

pip is unable to install the required package as it does not target python 2. Once a venv is created it should use the pip installed in the venv to install the packages.

poetry install -vvv         <aws:amazon-web-services>
The currently activated Python version 2.7.17 is not supported by the project (^3.6).
Trying to find and use a compatible version.
Trying python3
Using python3 (3.7.5)
Virtualenv tool-it-02NcbsqG-py3.7 already exists.
Using virtualenv: /Users/nick.perkins/Library/Caches/pypoetry/virtualenvs/tool-it-02NcbsqG-py3.7
Installing dependencies from lock file


Package operations: 28 installs, 0 updates, 0 removals, 2 skipped

  - Installing more-itertools (8.0.2)

[EnvCommandError]
Command ['pip', 'install', '--no-deps', 'more-itertools==8.0.2'] errored with the following return code 1, and output:
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
ERROR: Could not find a version that satisfies the requirement more-itertools==8.0.2 (from versions: 1.0, 1.1, 2.0, 2.1, 2.2, 2.3, 2.4, 2.4.1, 2.5.0, 2.6.0, 3.0.0, 3.1.0, 3.2.0, 4.0.0, 4.0.1, 4.1.0, 4.2.0, 4.3.0, 5.0.0)
ERROR: No matching distribution found for more-itertools==8.0.2


Traceback (most recent call last):
  File "/Users/nick.perkins/.poetry/lib/poetry/_vendor/py2.7/clikit/console_application.py", line 131, in run
    status_code = command.handle(parsed_args, io)
  File "/Users/nick.perkins/.poetry/lib/poetry/_vendor/py2.7/clikit/api/command/command.py", line 120, in handle
    status_code = self._do_handle(args, io)
  File "/Users/nick.perkins/.poetry/lib/poetry/_vendor/py2.7/clikit/api/command/command.py", line 171, in _do_handle
    return getattr(handler, handler_method)(args, io, self)
  File "/Users/nick.perkins/.poetry/lib/poetry/_vendor/py2.7/cleo/commands/command.py", line 92, in wrap_handle
    return self.handle()
  File "/Users/nick.perkins/.poetry/lib/poetry/console/commands/install.py", line 63, in handle
    return_code = installer.run()
  File "/Users/nick.perkins/.poetry/lib/poetry/installation/installer.py", line 74, in run
    self._do_install(local_repo)
  File "/Users/nick.perkins/.poetry/lib/poetry/installation/installer.py", line 286, in _do_install
    self._execute(op)
  File "/Users/nick.perkins/.poetry/lib/poetry/installation/installer.py", line 302, in _execute
    getattr(self, '_execute_{}'.format(method))(operation)
  File "/Users/nick.perkins/.poetry/lib/poetry/installation/installer.py", line 327, in _execute_install
    self._installer.install(operation.package)
  File "/Users/nick.perkins/.poetry/lib/poetry/installation/pip_installer.py", line 97, in install
    self.run(*args)
  File "/Users/nick.perkins/.poetry/lib/poetry/installation/pip_installer.py", line 118, in run
    return self._env.run_pip(*args, **kwargs)
  File "/Users/nick.perkins/.poetry/lib/poetry/utils/env.py", line 824, in run_pip
    return self._run(cmd, **kwargs)
  File "/Users/nick.perkins/.poetry/lib/poetry/utils/env.py", line 1052, in _run
    return super(VirtualEnv, self)._run(cmd, **kwargs)
  File "/Users/nick.perkins/.poetry/lib/poetry/utils/env.py", line 856, in _run
    raise EnvCommandError(e, input=input_)

[nickperkins]

That is exactly the issue.

With poetry now having functionality that creates a virtualenv that is compatible with the project (python3) it would also make sense to use that version of python to install the dependences.

[rvanlaar]

@DmytroLitvinov Did you solve this problem and what was your solution?

I have Poetry complaining that pip wasn’t installed. Where as pip3 was installed. After installing pip for python2 it wouldn’t install the correct packages.

Another system that is almost the same doesn’t have this problem.

Edit: Solved this by:

• installing pip3 as the user setting PATH to ~/.local/bin/:$PATH