poetry_fails_install_numpy.md

On MAC Os BigSur (11.1)

I've being facing issues all day with numpy failing install (with pandas) for Python 3.9.1.6 and poetry 1.1.4.

I understood that poetry uses pip which does not use the wheel version of numpy when pip <= 20.2.x. And fresh installation of Python 3.9.1.6 does not upgrade pip !

This is how I managed to install what I needed :

First check the default version of Python linked to poetry (reinstall it if it does not fit)

poetry env info | grep -i python
Python:         3.9.1
Implementation: CPython
Python:   /usr/local/Cellar/[email protected]/3.9.1_6/Frameworks/Python.framework/Versions/3.9

Install you project and run poetry init without any dependencies you seek (you'll use poetry add <deps> juste after...)

You should obtain something similar to this pyproject.toml :

[tool.poetry]
name = "project1"
version = "0.1.0"
description = ""
authors = [""]

[tool.poetry.dependencies]
python = "^3.9"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

Launch the poetry shell

➜  project1 poetry shell

Python 2.7 will no longer be supported in the next feature release of Poetry (1.2).
You should consider updating your Python version to a supported one.

Note that you will still be able to manage Python 2.7 projects by using the env command.
See https://python-poetry.org/docs/managing-environments/ for more information.

Spawning shell within /Users/vincent/Library/Caches/pypoetry/virtualenvs/project1-5XOg8Qie-py3.9
➜  project1 . /Users/vincent/Library/Caches/pypoetry/virtualenvs/project1-5XOg8Qie-py3.9/bin/activate
(project1-5XOg8Qie-py3.9) ➜  project1

At this point upgrade pip, wheel and setuptools !

(project1-5XOg8Qie-py3.9) ➜  project1 $ pip install --upgrade pip wheel setuptools
Looking in indexes: https://pypi.python.org/simple/
Collecting pip
  Using cached pip-20.3.3-py2.py3-none-any.whl (1.5 MB)
Collecting wheel
  Using cached wheel-0.36.2-py2.py3-none-any.whl (35 kB)
Collecting setuptools
  Using cached setuptools-51.1.2-py3-none-any.whl (784 kB)
Installing collected packages: pip, wheel, setuptools
  Attempting uninstall: pip
    Found existing installation: pip 20.2.4
    Uninstalling pip-20.2.4:
      Successfully uninstalled pip-20.2.4
  Attempting uninstall: wheel
    Found existing installation: wheel 0.35.1
    Uninstalling wheel-0.35.1:
      Successfully uninstalled wheel-0.35.1
  Attempting uninstall: setuptools
    Found existing installation: setuptools 50.3.2
    Uninstalling setuptools-50.3.2:
      Successfully uninstalled setuptools-50.3.2
Successfully installed pip-20.3.3 setuptools-51.1.2 wheel-0.36.2

Now installation should be ok

(project1-5XOg8Qie-py3.9) ➜  project1 poetry install
Installing dependencies from lock file

Package operations: 5 installs, 0 updates, 0 removals

  - Installing six (1.15.0)
  - Installing numpy (1.19.5)
  - Installing python-dateutil (2.8.1)
  - Installing pytz (2020.5)
  - Installing pandas (1.2.0)

Installing the current project: project1 (0.1.0)

Yeepee !