C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.14.26428\bin\Hostx86\x64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -If:\python\lib\site-packages\numpy\core\include -If:\python\include -If:\python\include "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6.1\include\um" /Tc./arch/univariate/recursions.c /Fobuild\temp.win32-3.7\Release\./arch/univariate/recursions.obj
    recursions.c
    f:\python\include\pyconfig.h(59): fatal error C1083: 无法打开包括文件: “io.h”: No such file or directory
    error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Community\\VC\\Tools\\MSVC\\14.14.26428\\bin\\Hostx86\\x64\\cl.exe' failed with exit status 2

    ----------------------------------------
Command "f:\python\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\吴勇\\AppData\\Local\\Temp\\pip-install-oln31731\\arch\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record C:\Users\吴勇\AppData\Local\Temp\pip-record-qcw3oxh6\install-record.txt --single-version-externally-managed --compile" failed with error code 1 in C:\Users\吴勇\AppData\Local\Temp\pip-install-oln31731\arch\

安装arch时一开始找不到cl.exe，后来安装了visual studio，然后在里面找到了el.exe，并且设置为环境变量，之后出现了这个问题