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python - 诗歌将python版本更改为3.x

问题描述

根据poetry的文档，设置新项目的正确方法是 with poetry new poetry-demo，但是这会通过创建以下 toml 文件来创建一个基于现已弃用的 python2.7 的项目：

[tool.poetry]
name = "poetry-demo"
version = "0.1.0"
description = ""
authors = ["Harsha Goli <harshagoli@gmail.com>"]

[tool.poetry.dependencies]
python = "^2.7"

[tool.poetry.dev-dependencies]
pytest = "^4.6"

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

如何将其更新到 3.7？运行时只需更改python = "^2.7"为python = "^3.7"会导致以下错误poetry install：

[SolverProblemError]
The current project's Python requirement (2.7.17) is not compatible with some of the required packages Python requirement:
  - zipp requires Python >=3.6

Because no versions of pytest match >=4.6,<4.6.9 || >4.6.9,<5.0
 and pytest (4.6.9) depends on importlib-metadata (>=0.12), pytest (>=4.6,<5.0) requires importlib-metadata (>=0.12).
And because no versions of importlib-metadata match >=0.12,<1.5.0 || >1.5.0
 and importlib-metadata (1.5.0) depends on zipp (>=0.5), pytest (>=4.6,<5.0) requires zipp (>=0.5).
Because zipp (3.1.0) requires Python >=3.6
 and no versions of zipp match >=0.5,<3.1.0 || >3.1.0, zipp is forbidden.
Thus, pytest is forbidden.
So, because poetry-demo depends on pytest (^4.6), version solving failed.

标签： pythonpython-poetry

解决方案

每当您手动更改依赖项时，pyproject.toml您都必须注意以下几点：

  1. 之后运行poetry lock或删除poetry.lock文件以强制重新创建它。poetry install这样做的原因是，poetry.lock如果可以找到一个而不是pyproject.toml.

  2. 如果您更改 python 版本并使用项目内 virtualenv，请删除.venv运行前的poetry install. 诗歌一旦创建就不会更改 venv 的 python 版本，因为它使用 python 版本本身来创建 virtualenv。

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