File not found error when using poetry with conda on windows.

• 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: Tested on windows-server-2019-vs2019 & windows 10
• Poetry version: 1.1.4
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/Skyscimitar/773486e6c45ada643abf74c36e1c81cb

Issue

When creating a new poetry environment (installed with conda) poetry fails to correctly set up the environment. Throwing an exception when almost any poetry command is run.

To reproduce, on a windows machine with miniconda3 installed:

conda install poetry=1.1.4 python=3.7.5
poetry install

This immediately raises the following exception:

Creating virtualenv atoti-root-znQbab7L-py3.7 in C:\Users\circleci\AppData\Local\pypoetry\Cache\virtualenvs

  FileNotFoundError

  [Errno 2] No such file or directory: 'C:\\tools\\miniconda3\\Lib\\venv\\scripts\\nt\\python.exe'

  at C:\tools\miniconda3\lib\shutil.py:120 in copyfile
Traceback (most recent call last):
  File "C:\tools\miniconda3\lib\site-packages\clikit\console_application.py", line 131, in run
    status_code = command.handle(parsed_args, io)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\command\command.py", line 120, in handle
    status_code = self._do_handle(args, io)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\command\command.py", line 163, in _do_handle
    self._dispatcher.dispatch(PRE_HANDLE, event)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\event\event_dispatcher.py", line 22, in dispatch
    self._do_dispatch(listeners, event_name, event)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\event\event_dispatcher.py", line 89, in _do_dispatch
    listener(event, event_name, self)
  File "C:\tools\miniconda3\lib\site-packages\poetry\console\config\application_config.py", line 119, in set_env
    env = env_manager.create_venv(io)
  File "C:\tools\miniconda3\lib\site-packages\poetry\utils\env.py", line 645, in create_venv
    self.build_venv(venv, executable=executable)
  File "C:\tools\miniconda3\lib\site-packages\poetry\utils\env.py", line 692, in build_venv
    str(path),
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\run\__init__.py", line 28, in cli_run
    of_session.run()
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\run\session.py", line 46, in run
    self._create()
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\run\session.py", line 53, in _create
    self.creator.run()
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\create\creator.py", line 161, in run
    self.create()
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\create\via_global_ref\builtin\via_global_self_do.py", line 97, in create
    src.run(self, self.symlinks)
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\create\via_global_ref\builtin\ref.py", line 157, in run
    method(self.src, dest)
  File "C:\tools\miniconda3\lib\site-packages\virtualenv\util\path\_sync.py", line 53, in copy
    method(norm(src), norm(dest))
  File "C:\tools\miniconda3\lib\shutil.py", line 248, in copy
    copyfile(src, dst, follow_symlinks=follow_symlinks)
  File "C:\tools\miniconda3\lib\shutil.py", line 120, in copyfile
    with open(src, 'rb') as fsrc:
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\tools\\miniconda3\\Lib\\venv\\scripts\\nt\\python.exe'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\tools\miniconda3\Scripts\poetry-script.py", line 10, in <module>
    sys.exit(main())
  File "C:\tools\miniconda3\lib\site-packages\poetry\console\__init__.py", line 5, in main
    return Application().run()
  File "C:\tools\miniconda3\lib\site-packages\clikit\console_application.py", line 142, in run
    trace.render(io, simple=isinstance(e, CliKitException))
  File "C:\tools\miniconda3\lib\site-packages\clikit\ui\components\exception_trace.py", line 232, in render
    return self._render_exception(io, self._exception)
  File "C:\tools\miniconda3\lib\site-packages\clikit\ui\components\exception_trace.py", line 269, in _render_exception
    self._render_snippet(io, current_frame)
  File "C:\tools\miniconda3\lib\site-packages\clikit\ui\components\exception_trace.py", line 289, in _render_snippet
    self._render_line(io, code_line)
  File "C:\tools\miniconda3\lib\site-packages\clikit\ui\components\exception_trace.py", line 402, in _render_line
    io.write_line("{}{}".format(indent * " ", line))
  File "C:\tools\miniconda3\lib\site-packages\cleo\io\io_mixin.py", line 65, in write_line
    super(IOMixin, self).write_line(string, flags)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\io\io.py", line 66, in write_line
    self._output.write_line(string, flags=flags)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\io\output.py", line 69, in write_line
    self.write(string, flags=flags, new_line=True)
  File "C:\tools\miniconda3\lib\site-packages\clikit\api\io\output.py", line 61, in write
    self._stream.write(to_str(formatted))
  File "C:\tools\miniconda3\lib\site-packages\clikit\io\output_stream\stream_output_stream.py", line 24, in write
    self._stream.write(string)
  File "C:\tools\miniconda3\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u2502' in position 10: character maps to <undefined>

It seems that the python executable path C:\\tools\\miniconda3\\Lib\\venv\\scripts\\nt\\python.exe is incorrect’ which is odd, since the poetry environment seems to indicate the correct executable though, in pyvenv.cfg we have the following:

home = C:\tools\miniconda3
implementation = CPython
version_info = 3.7.5.final.0
virtualenv = 20.1.0
include-system-site-packages = false
base-prefix = C:\tools\miniconda3
base-exec-prefix = C:\tools\miniconda3
base-executable = C:\tools\miniconda3\python.exe

which seems to point to the correct python executable.

[Skyscimitar]

You’re right, it’s a virtualenv issue. Linking the relevant virtualenv issue for reference. Thank you for your help 😃

For anyone who runs into the same problem, a workaround is to downgrade virtualenv to 20.0.33

[Skyscimitar]

Hi! We downgrade virtualenv inside the conda environment in our circle CI windows executors, not sure if it with pip or not.

So adding a step like this to your yml config should fix the issue (or just adding virtualenv=20.0.33 to the step where you install your conda dependencies):

- run: conda install virtualenv=20.0.33