blog: announce Poetry 2.0.0

Author: radoering

content/blog/2024-12-07-announcing-poetry-2-0-0.md

@@ -0,0 +1,177 @@
+---
+layout: single
+title: "Announcing Poetry 2.0.0"
+date: 2024-12-07
+categories: [releases]
+tags: ["2.x", "2.0"]
+---
+
+The Poetry team is pleased to announce the immediate availability of Poetry **2.0.0**.
+
+<!--more-->
+
+If you have a previous version of Poetry installed via `pipx`,
+getting Poetry **2.0.0** is as easy as:
+
+```bash
+$ pipx upgrade poetry
+```
+
+If you used the [official installer](/docs/#installation), you can run:
+
+```bash
+$ poetry self update
+```
+
+## Highlights
+
+### Supporting the `project` section in pyproject.toml (PEP 621)
+
+Poetry 2.0 respects the `project` section in the `pyproject.toml` as originally
+specified in [PEP 621](https://peps.python.org/pep-0621/) and now defined in the
+[pyproject.toml specification](https://packaging.python.org/en/latest/specifications/pyproject-toml/#pyproject-toml-spec).
+You can replace many fields in the `tool.poetry` section with their counterparts in the `project` section:
+
+```toml
+[project]
+name = "poetry-demo"
+version = "0.1.0"
+description = ""
+authors = [
+    {name = "Sébastien Eustace", email = "[email protected]"}
+]
+readme = "README.md"
+requires-python = ">=3.8"
+
+[tool.poetry]
+packages = [{include = "poetry_demo"}]
+
+[build-system]
+requires = ["poetry-core>=2.0"]
+build-backend = "poetry.core.masonry.api"
+```
+
+Moreover, many fields in the `tool.poetry` section are deprecated in favor
+of their counterparts in the `project` section. Run
+
+```bash
+poetry check
+```
+
+to see a list of deprecated fields in your `pyproject.toml` and their replacements
+or have a look into the [documentation](https://python-poetry.org/docs/main/pyproject/)
+to check if a field is deprecated.
+
+Please note that `tool.poetry.dependencies` is not deprecated because it supports features
+that are not supported by `project.dependencies`. Therefore, you have several options,
+which are explained in detail in
+[`project.dependencies` and `tool.poetry.dependencies`](https://python-poetry.org/docs/main/dependency-specification/#projectdependencies-and-toolpoetrydependencies):
+
+- If you only need standard features, we recommend to replace `tool.poetry.dependencies` with `project.dependencies`.
+- If you need Poetry specific features, you can still use `project.dependencies`
+  and add additional information in `tool.poetry.dependencies`.
+- If you are heavily using Poetry specific features, you can declare `project.dependencies` as `dynamic`
+  and solely use `tool.poetry.dependencies`.
+
+### Project plugins and forcing a minimum Poetry version
+
+You can now specify that your project depends on certain plugins:
+
+```toml
+[tool.poetry.requires-plugins]
+my-application-plugin = ">1.0"
+```
+
+If you run `poetry install` and the plugin is not installed,
+Poetry will install it only for your project. See
+[project plugins](https://python-poetry.org/docs/main/plugins/#project-plugins)
+for details.
+
+Further, you can specify that your project requires a minimum version of Poetry.
+For example, if you are using the `project` section, you can specify:
+
+```toml
+[tool.poetry]
+requires-poetry = ">=2.0"
+```
+
+### Locking resulting markers and groups
+
+This change is more under the hood but might be useful for debugging or auditing purposes
+and enables future improvements. Poetry now includes the resulting groups and markers
+for each package in the lock file, e.g.:
+
+```toml
+groups = ["main", "dev"]
+markers = 'sys_platform == "win32"'
+```
+
+for a package that is required in the `main` and `dev` group but only on Windows.
+
+Currently, this information is not used by default but you can configure Poetry to
+use this information during installation:
+
+```bash
+poetry config installer.re-resolve false
+```
+
+Per default, when installing packages from a lock file, Poetry re-resolves the dependencies
+with the packages from the lock file being the only source for packages. If you
+deactivate this behavior (and the lock file has been created with Poetry 2.0),
+it will not re-resolve but just evaluate the locked groups and markers to decide
+if a package should be installed.
+
+Setting `installer.re-resolve` to `false` might result in faster installations,
+especially if your dependency tree is more deep than broad.
+
+## Breaking changes and removals
+
+In the following, we only explain the most important breaking changes and removals.
+Many deprecated features have been removed in this major release.
+For a full list of changes and removals, see the changelog.
+
+### `poetry export` and `poetry shell` only available via plugins
+
+Since Poetry 1.2, `poetry export` is not a core feature of Poetry but
+is provided by `poetry-plugin-export`. However, previously `poetry-plugin-export`
+had been a dependency of Poetry itself and thus was installed per default.
+As announced in the last two minor releases, `poetry-plugin-export` is not included
+anymore in the default Poetry installation. See
+[Using plugin](https://python-poetry.org/docs/main/plugins/#using-plugins)
+for how to install plugins or even define that a plugin is required for your project.
+
+Although not announced before, we seized the chance of a major release to remove the
+`poetry shell` command . Due to several issues with `poetry shell`, we recommend
+to use the new `poetry env activate` command instead. This command does only print
+the command to activate the virtual environment. See
+[Activating the environment](https://python-poetry.org/docs/main/managing-environments/#activating-the-environment)
+for examples how to activate the environment in different shells. If you still want to
+use `poetry shell`, you can install the `poetry-plugin-shell` plugin.
+
+### `poetry lock` defaults to `--no-update`
+
+`poetry lock` now defaults to `--no-update` to prevent accidental updates of the lock file.
+If you want to regenerate the lock file from scratch (old default behavior),
+you can use `poetry lock --regenerate`.
+
+### `poetry add --optional` requires an extra
+
+In order to support the `project` section the interface of `poetry add --optional`
+had to be changed so that you cannot add optional dependencies without specifying
+an extra anymore.
+
+### `--directory`/`-C` actually switches the directory
+
+The `--directory`/`-C` option now actually switches the directory instead of just setting
+the directory as project root. The old behavior is now available via `--project`/`-P`.
+
+### Consistent `include` behavior
+
+When using `tool.poetry.include` without specifying the format, Poetry now defaults
+to "only sdist". Previously, it defaulted to "only sdist" for directories and to
+"sdist and wheel" for files. We recommend to be explicit and specify the formats
+instead of relying on the default.
+
+## Changelog
+
+TODO

content/history.md

@@ -4,6 +4,8 @@ layout: single
 title: History
 ---
 
+# TODO: update history
+
 ## [1.8.5] - 2024-12-06
 
 ### Changed

pyproject.toml

@@ -65,7 +65,7 @@ tags = "/blog/tag/:title/"
 description = "Python dependency management and packaging made easy"
 
 [tool.website.config.params.documentation]
-defaultVersion = "1.8"
+defaultVersion = "1.8"  # TODO: update default version
 
 [tool.website.config.markup.goldmark.renderer]
 unsafe = true
@@ -74,7 +74,7 @@ unsafe = true
 keepWhitespace = true
 
 [tool.website.versions]
-"1.8" = "1.8"
+"1.8" = "1.8"  # TODO: update versions
 "1.7" = "1.7"
 
 [build-system]