Microsoft Visual C++ 14.0 is required

總所周知 ujson 要比 json 模塊高效，可是安裝也太麻煩了。之前在 Windows7 中使用 Python2.x 的第三方模塊 ujson ，使用pip install ujson 安裝時沒有問題的，換成 Windows10 的時候報錯了。

報錯如下：

C:\>pip install ujson
Collecting ujson
  Downloading https://files.pythonhosted.org/packages/16/c4/79f3409bc710559015464e5f49b9879430d8f87498ecdc335899732e5377/ujson-1.35.tar.gz (192kB)
    100% |████████████████████████████████| 194kB 64kB/s
Building wheels for collected packages: ujson
  Running setup.py bdist_wheel for ujson ... error
  Complete output from command c:\programdata\anaconda3\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\niko\\AppData\\Local\\Temp\\pip-install-6naov7i3\\ujson\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d C:\Users\niko\AppData\Local\Temp\pip-wheel-v4jxz935 --python-tag cp36:
  running bdist_wheel
  running build
  running build_ext
  building 'ujson' extension
  error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/

  ----------------------------------------
  Failed building wheel for ujson
  Running setup.py clean for ujson
Failed to build ujson
Installing collected packages: ujson
  Running setup.py install for ujson ... error
    Complete output from command c:\programdata\anaconda3\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\niko\\AppData\\Local\\Temp\\pip-install-6naov7i3\\ujson\\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\niko\AppData\Local\Temp\pip-record-dnr78gng\install-record.txt --single-version-externally-managed --compile:
    running install
    running build
    running build_ext
    building 'ujson' extension
    error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/

    ----------------------------------------
Command "c:\programdata\anaconda3\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\niko\\AppData\\Local\\Temp\\pip-install-6naov7i3\\ujson\\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\niko\AppData\Local\Temp\pip-record-dnr78gng\install-record.txt --single-version-externally-managed --compile" failed with error code 1 in C:\Users\niko\AppData\Local\Temp\pip-install-6naov7i3\ujson\

大體意思就是缺少編譯ujson的C++編譯工具，經過查閱得知：

Python 2.7需要Microsoft Visual C++ 9.0的庫
Python 3.6需要Microsoft Visual C++ 14.0的庫

很顯然，解決方案只有兩種了：

• 下載whl文件直接安裝（Python2和Python3適用）

  下載地址：https://www.lfd.uci.edu/~gohlke/pythonlibs/
  在這里可以搜索你想要的庫!!!
  使用 pip install xxx.whl 安裝即可。

• 下載Microsoft Visual C++ Build Tools（Python3適用）

  下載微軟的C++編譯工具，CSDN上下載竟然花錢，氣死我了...我特么還是學生呢...在這里下載吧，免費的：http://down.51cto.com/data/2452424
  下載完成使用管理員權限打開，安裝Windows10SDK和.NET框架即可!!!