如何在诗歌管理的python>=3.5项目下使用python black formatter？

Question

我用 Poetry 创建了一个 python 项目“foo”。这是以下内容pyproject.toml：

[tool.poetry]
name = "bar"
version = "0.1.0"
description = ""

[tool.poetry.dependencies]
python = ">=3.5"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

该包兼容Python3.5。我想要黑色格式化程序，它与Python3.5不兼容。我觉得使用Python>=3.6开发是没有问题的，但是无法安装black formatter：

[tool.poetry]
name = "bar"
version = "0.1.0"
description = ""

[tool.poetry.dependencies]
python = ">=3.5"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

所以我直接安装了黑色pip：

$ poetry add black --dev
[SolverProblemError]
The current project's Python requirement (>=3.5) is not compatible with some of the required packages Python requirement:
  - black requires Python >=3.6

Because no versions of black match >19.10b0,<20.0
 and black (19.10b0) requires Python >=3.6, black is forbidden.
So, because bar depends on black (^19.10b0), version solving failed.

这种方式不太适合我。我想black通过诗歌来安装。

我应该怎么做？（我不想修改依赖项python>=3.6）

Answer 1

看起来有点晚了，但实际上你可以做你想做的，即使黑色仅支持 Python >=3.6.2

在 pyproject.toml 中，您可以定义受限制的依赖关系，如https://python-poetry.org/docs/dependency-specification/#python-restricted-dependencies中所述

[tool.poetry.dependencies]
python = ">=3.5"

[tool.poetry.dev-dependencies]
black = {version = "^21.7b0", python = ">=3.6.2"}

Poetry 不会抱怨，你也不会有任何问题，因为它是一个开发依赖项。