Poetry SolverProblemError

[rvanruitenbeek]

First of all, thanks for writing this amazing template!

I tried to use the template for the creation of a new Python 3.8.5 project.

Steps I have taken to create the project:

1. cookiecutter cookiecutter-hypoermodern-python
2. poetry lock

The resulting output I received is:

[SolverProblemError]
The current project's Python requirement (>=3.7) is not compatible with some of the required packages Python requirement:
  - isort requires Python >=3.6.1,<4.0

Because isort (5.10.1) requires Python >=3.6.1,<4.0
 and no versions of isort match >5.10.1, isort is forbidden.
So, because some-sample depends on isort (>=5.10.1), version solving failed.

Things I tried so far:

• Removing the isort package from the toml --> shifts the problem to other packages
• Removing the lock file before creating the template

[eyllanesc]

@cjolowicz

I think the solution is to change:

cookiecutter-hypermodern-python/{{cookiecutter.project_name}}/pyproject.toml

Line 24 in b952b2c

python = ">=3.7"

to python = ">=3.7,<4.0" since this template only checks for python3 and python4 doesn't exist yet.

[cjolowicz]

Hi,

The upper bound on the Python constraint was removed intentionally. See the rationale linked from here: cjolowicz/cookiecutter-hypermodern-python-instance#743

It is possible to add dependencies that cap the Python version by adding an environment marker on the requirement. In Poetry this is done using the --python option of the add subcommand. See here for an example:
cjolowicz/cookiecutter-hypermodern-python-instance#815

[eyllanesc]

@cjolowicz I understand what you indicate. I have created #1152 to solve that problem.

On the other hand, the tool that imports the changes from https://github.com/cjolowicz/cookiecutter-hypermodern-python-instance to this repository has some problems since it is modifying files that it should not modify, so I recommend creating a blacklist that copies but does not deduce templates. In the case of poetry.lock I observe:

cookiecutter-hypermodern-python/{{cookiecutter.project_name}}/poetry.lock

Line 91 in b952b2c

typing-extensions = {version = ">=3.1{{cookiecutter.version}}", markers = "python_version < \"3.10\""}