第一次使用pip，尝试使用python-docs-samples 教程库 https://github.com/GoogleCloudPlatform/python-docs-samples。当我运行“python -m pip install -rrequirements.txt”命令时，会引入很多脚本，但随后我收到一系列“构建轮失败”错误。其中之一显示在随附的代码块中（请原谅手写的自动换行换行符）。
问题是什么？有人以前见过这个吗？我没有更改库的任何部分或使用它的代码，并且我使用的是 Python 2.7.12，它应该对 PIP 具有良好的内置支持。
Running setup.py bdist_wheel for PyYAML ... error
Complete output from command C:\users\owner\python-docs-samples\env\Scripts\python.exe
-u -c "import setuptools, tokenize;__file__='c:\\users\\owner\\appdata\\local\\temp\\
pip-build-86ysrg\\PyYAML\setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__)
.read().replace('\r\n', '\n'), __file__, 'exec'))" bdist_wheel -d c:\users\owner\appdata
\local\temp\tmpljy6z0pip-wheel- --python-tag cp27:
running bdist_wheel
running build
running build_py
creating build
creating build\lib.win32-2.7
creating build\lib.win32-2.7\yaml
copying lib\yaml\composer.py -> build\lib.win32-2.7\yaml
copying lib\yaml\constructor.py -> build\lib.win32-2.7\yaml
copying lib\yaml\cyaml.py -> build\lib.win32-2.7\yaml
copying lib\yaml\dumper.py -> build\lib.win32-2.7\yaml
copying lib\yaml\emitter.py -> build\lib.win32-2.7\yaml
copying lib\yaml\error.py -> build\lib.win32-2.7\yaml
copying lib\yaml\events.py -> build\lib.win32-2.7\yaml
copying lib\yaml\loader.py -> build\lib.win32-2.7\yaml
copying lib\yaml\nodes.py -> build\lib.win32-2.7\yaml
copying lib\yaml\parser.py -> build\lib.win32-2.7\yaml
copying lib\yaml\reader.py -> build\lib.win32-2.7\yaml
copying lib\yaml\representer.py -> build\lib.win32-2.7\yaml
copying lib\yaml\resolver.py -> build\lib.win32-2.7\yaml
copying lib\yaml\scanner.py -> build\lib.win32-2.7\yaml
copying lib\yaml\serializer.py -> build\lib.win32-2.7\yaml
copying lib\yaml\tokens.py -> build\lib.win32-2.7\yaml
copying lib\yaml\__init__.py -> build\lib.win32-2.7\yaml
running build_ext
creating build\temp.win32-2.7
creating build\temp.win32-2.7\Release
checking if libyaml is compilable
error: [Error 2] The system cannot find the file specified
----------------------------------------
Failed building wheel for PyYAML
Running setup.py clean for PyYAML
安装通用依赖项
sudo apt-get install build-essential autoconf libtool pkg-config python-opengl python-pil python-pyrex python-pyside.qtopengl idle-python2.7 qt4-dev-tools qt4-designer libqtgui4 libqtcore4 libqt4-xml libqt4-test libqt4-script libqt4-network libqt4-dbus python-qt4 python-qt4-gl libgle3 python-dev
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