python - 诗歌：使用 python >= 2.7 解决依赖问题

Question

我有一个基于 Python 2.7 和 Python 3.9 的项目。

我正在使用以下 pyproject.toml：

[build-system]
requires = ["poetry_core>=1.1.4"]
build-backend = "poetry.core.masonry.api"

[tool.poetry]
name = "MyProject"
version = "1.0.0"
description = ""
authors = [""]
readme = ""
repository = ""
homepage = ""

[tool.poetry.dependencies]
python = ">=2.7"
bcrypt = "*"
pywin32 = [
    {version = "228", python = "^2.7"},
    {version = "300", python = "^3.0"}, 
]

执行时，进程永远poetry update停留在原处。"Resolving dependencies..."

如果我用它替换python依赖python = "^2.7"项（但不能在python 3上安装），并且如果我用它替换python = "^3.0"它也可以（但不能在python 2上安装）。

我应该怎么办 ？