在windows 10種使用pip安裝greenlet時，遇到下面這樣一個錯誤，通過搜尋發現有很多類似的情況發生在安裝scrapy/twisted等庫的時候，看起來時需要一個c++編譯器。安裝vstudio實在太大了，網上也給出了不少解決方案，但是下面這個是簡單的，直接pip安裝二進位制版

pip install --only-binary :all: greenlet

Complete output from command e:\erp\odoo\odooerp\scripts\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\ZC\\AppData\\Local\\Temp\\pip-install-vgxn_5e4\\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 C:\Users\ZC\AppData\Local\Temp\pip-record-_wtj3pp7\install-record.txt --single-version-externally-managed --compile --install-headers e:\erp\odoo\odooerp\include\site\python3.6\greenlet:
    running install
    running build
    running build_ext
    building 'greenlet' extension
    error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/

    ----------------------------------------
Command "e:\erp\odoo\odooerp\scripts\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\ZC\\AppData\\Local\\Temp\\pip-install-vgxn_5e4\\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 C:\Users\ZC\AppData\Local\Temp\pip-record-_wtj3pp7\install-record.txt --single-version-externally-managed --compile --install-headers e:\erp\odoo\odooerp\include\site\python3.6\greenlet" failed with error code 1 in C:\Users\ZC\AppData\Local\Temp\pip-install-vgxn_5e4\greenlet\