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poetryでSolverProblemError

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1. 環境

(.venv) user$ python --version
Python 3.7.6
(.venv) user$ poetry -V
Poetry version 1.0.3

2. 現象

Cythonをインストールする時に以下のようなSolverProblemErrorが発生.

(.venv) user$ poetry install
Installing dependencies from lock file
Warning: The lock file is not up to date with the latest changes in pyproject.toml. You may be getting outdated dependencies. Run update to update them.

[SolverProblemError]
Because annotator depends on Cython (0.29.15) which doesn't match any versions, version solving failed.

Cythonは0.29.15で指定していた.

pyproject.toml
...
[tool.poetry.dependencies]
Cython = "0.29.15"
...

3. 解決策

poetry addならいける.

(.venv) user$ poetry add Cython
Using version ^0.29.15 for Cython

Updating dependencies
Resolving dependencies... (0.4s)


Package operations: 1 install, 0 updates, 0 removals

  - Installing cython (0.29.15)

poetry addだと自動的にバージョンを^で指定する.

pyproject.toml
...
[tool.poetry.dependencies]
Cython = "^0.29.15"
...

どうやらこれが必要だった模様.

Cython=0.29.15はpypiにもあるし,ドキュメント
によるとこの方法で指定すると>= 0.29.15 < 1.0.0になるはずなので0.29.15指定でも良さそうなものだが...

ちなみにaddじゃなくてもCython = "^0.29.15"で指定してinstallでもいける.

(.venv) user$ poetry install
Installing dependencies from lock file

Package operations: 1 install, 0 updates, 0 removals

  - Installing cython (0.29.15)

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