安装Virtualenv install时，我遇到了错误1

Question

我正在用python3.6运行virtualenv，并尝试加载测试django应用程序。在成功安装所有依赖项之后，我得到以下错误。你知道吗

Installing collected packages: greenlet, gevent, locustio
  Running setup.py install for greenlet ... error
    Complete output from command /Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/private/var/folders/3t/_nx5hykn0hsfs5v1x_svhdym0000gn/T/pip-install-lrm7ibd5/greenlet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/3t/_nx5hykn0hsfs5v1x_svhdym0000gn/T/pip-record-77exz0iu/install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_ext
    building 'greenlet' extension
    creating build
    creating build/temp.macosx-10.6-intel-3.6
    gcc -fno-strict-aliasing -Wsign-compare -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -arch i386 -arch x86_64 -g -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m -c greenlet.c -o build/temp.macosx-10.6-intel-3.6/greenlet.o
    xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
    error: command 'gcc' failed with exit status 1

----------------------------------------
Command "/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/private/var/folders/3t/_nx5hykn0hsfs5v1x_svhdym0000gn/T/pip-install-lrm7ibd5/greenlet/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/3t/_nx5hykn0hsfs5v1x_svhdym0000gn/T/pip-record-77exz0iu/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/3t/_nx5hykn0hsfs5v1x_svhdym0000gn/T/pip-install-lrm7ibd5/greenlet/

Answer 1

运行在终端xcode-select install这将安装xcode命令行工具（不是xcode本身），您将被要求输入密码并同意许可证。你知道吗

这是因为其中一个（或多个）包包含需要编译的C扩展，而要编译xcode，则需要命令行工具。你知道吗

一个单独的解决方案是安装anacondapython，miniconda如果您不需要用于scientific python的包，这个python发行版包括一个包管理器（conda），它的工作方式与pip非常相似，但具有预编译包的优势