为什么 Travis CI 无法构建 Python 项目？

Question

我有一个简单的 Python 脚本，它使用 Microsoft 的 API ( Pywin32 )。我能够运行在我的本地机器上成功地执行该项目，但在 Travis 中，它会抛出一个错误 -

    100% |████████████████████████████████| 51kB 17.9MB/s 
Collecting pylint==2.2.2 (from -r requirements.txt (line 15))
  Downloading https://files.pythonhosted.org/packages/a5/06/ecef826f319055e6b231716730d7f9047dd7524ffda224b521d989f085b6/pylint-2.2.2-py3-none-any.whl (750kB)
    100% |████████████████████████████████| 757kB 18.9MB/s 
Collecting pywin32==224 (from -r requirements.txt (line 16))
  Could not find a version that satisfies the requirement pywin32==224 (from -r requirements.txt (line 16)) (from versions: )
No matching distribution found for pywin32==224 (from -r requirements.txt (line 16))
The command "pip install -r requirements.txt" failed and exited with 1 during .
Your build has been stopped.

在我的本地系统中 Python 版本是 3.6.6 并且 pip 是 18.1 。但是如果您在 Travis 中注意到，pip 版本是 10.0.1 。这可能是问题所在吗？

我的 travis.yml 文件包含 -

language: python
python:
  - "3.6.6"
pip:
  - "18.1"
install:
  - pip install -r requirements.txt
script:
  - python main.py

Python 包 pywin32==224 存在并且可以在我的本地计算机上下载，所以我猜错误不是他们那边的。

感谢您的帮助。

编辑-

尝试安装 Python 后，出现以下错误：

0.01s$ source ~/virtualenv/python3.6/bin/activate
$ python --version
Python 3.6.3
$ pip --version
pip 9.0.1 from /home/travis/virtualenv/python3.6.3/lib/python3.6/site-packages (python 3.6)
0.08s$ choco install python3
choco: command not found
The command "choco install python3" failed and exited with 127 during .
Your build has been stopped.

编辑 2 -

新.travis.yml :

language: python
python:
  - "3.6"
os: windows
before_install:
        - choco install python3
        - export PATH="/c/Python37:/c/Python37/Scripts:$PATH"
        - python -m pip install --upgrade pip wheel
install:
  - pip install -r requirements.txt
script:
  - python main.py

输出-

Worker information

The language 'python' is currently unsupported on the Windows Build Environment.
Let us know if you'd like to see it: https://travis-ci.community/c/environments/windows. Thanks for understanding!

Answer 1

pywin32 是 WinAPI 包装器，因此它只是 Windows 包，您不能在 Linux.

上使用它

Travis CI 默认在 Linux 上运行，但自 2018 年 10 月以来，可以通过在 .travis.yml 文件中添加 os: windows 来使用 Windows .查看 Travis blog post 这个。

然而，由于它是 "early access" 功能，它仍然遗漏了很多东西，包括 Python support. So if you need Python now - the only way is to install it manually, i.e. like here

更新示例（2020 年 4 月）Python 3.8 现在似乎是默认值：

- os: windows
  language: sh
  python: "3.8"
  before_install:
        - choco install python3
        - export PATH="/c/Python38:/c/Python38/Scripts:$PATH"
        - python -m pip install --upgrade pip wheel

为什么 Travis CI 无法构建 Python 项目？

Why does Travis CI fails to build Python project?

python

continuous-integration

pip

python-3.x

travis-ci