包需要不同的 Python：2.7.17 not in '>=3.6.1' while setting up pre-commit

Question

我克隆了一个存储库，安装了 pre-commit 并且是第一次提交。 这是实际安装和设置预提交包的时间。我遇到了以下问题。

[INFO] Installing environment for https://github.com/asottile/seed-isort-config.
[INFO] Once installed this environment will be reused.
[INFO] This may take a few minutes...
An unexpected error has occurred: CalledProcessError: command: ('/home/roopak/.cache/pre-commit/repokb2ckm/py_env-python2.7/bin/python', u'/home/roopak/.cache/pre-commit/repokb2ckm/py_env-python2.7/bin/pip', 'install', '.')
return code: 1
expected return code: 0
stdout:
    Processing /home/roopak/.cache/pre-commit/repokb2ckm

stderr:
    DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
    ERROR: Package 'seed-isort-config' requires a different Python: 2.7.17 not in '>=3.6.1'

Answer 1

问题是我同时安装了 Python2.7 和 3。我的pre-commit 安装时默认使用 Python 2.7。

---

解决方案一：从 Python2.7 中移除 pre-commit 并将其添加到 Python3。

根据 pre-commit 的创建者 - @anthony-sottile - 最好在 Python3 中使用 pre-commit。为此，我们必须从 Python2.7 卸载 pre-commit 并通过 Python3 安装它。

$ pip uninstall pre-commit  # uninstall from Python2.7
$ pip3 install pre-commit # install with Python3

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解决方案 2：使用 Python2.7 保持预提交（不推荐）

为了解决这个问题，我使用了预提交文档中的default_language_version。 参考：https://pre-commit.com/#overriding-language-version

通过设置default_language_version，所有钩子都将使用这个特定版本。如果需要覆盖任何特定的挂钩，则可以在挂钩上设置此属性 - language_version:。

例如：-

default_language_version:
    # force all unspecified python hooks to run python3
    python: python3
repos:
-   repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v2.5.0
    hooks:
      - id: trailing-whitespace
        name: trim trailing whitespace
        description: This hook trims trailing whitespace on files
        entry: trailing-whitespace-fixer

      - id: check-merge-conflict
        name: check for merge conflict
        description: Prevent accidentally commiting files with merge conflicts.
        language_version:
            python: python2.7

此示例.pre-commit-config.yaml 文件将默认 python 版本设置为 Python 3。对于钩子 - check-merge-conflict，它将使用 Python 2.7。