当我尝试poetry add cryptography在 Python 3.9.0 虚拟环境中使用 Python Poetry 1.1.4 包管理器 ( ) 安装加密模块时，我得到：
error: can't find Rust compiler
If you are using an outdated pip version, it is possible a prebuilt wheel is available for this package but pip is not able to install from it. Installing from the wheel would avoid the need for a Rust compiler.
To update pip, run:
pip install --upgrade pip
and then retry package installation.
If you did intend to build this …我正在尝试设置一个 Python docker 容器，当我运行命令“docker-compose up”来构建Dockerfile它时，它会在下面向我抛出此错误消息。
docker文件两周前就搭建成功了，我想到要重建docker容器，因为requirements.txt.
尝试构建映像会产生以下错误：
Collecting cryptography
Downloading cryptography-2.8.tar.gz (504 kB)
Installing build dependencies: started
Installing build dependencies: finished with status 'error'
ERROR: Command errored out with exit status 1:
command: /usr/local/bin/python /usr/local/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-6ilf25i_/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.8,!=1.11.3; platform_python_implementation != '"'"'PyPy'"'"''
cwd: None
Complete output (140 lines):
Collecting setuptools>=40.6.0
Downloading setuptools-46.0.0-py3-none-any.whl (582 kB)
Collecting wheel
Downloading wheel-0.34.2-py2.py3-none-any.whl (26 kB)
Collecting cffi!=1.11.3,>=1.8
Downloading cffi-1.14.0.tar.gz …