PIP毛病：需要Microsoft Visual C ++ 14.0-英雄云拓展知识分享

我只是运行以下命令：

pip install -U steem

并且该安装效果很好，直到没法安装 pycrypto。以后我做了

pip install cryptography

命令是由于我认为这是丢失的软件包。所以我的问题是，我如何安装 steem 没有pycrypto-error（或其他pycrypto包装）和如何卸载我不需要的密码包装。 （我正在使用Windows 7和Python 3）

Requirement already up-to-date: python-dateutil in c:\users\***\appdata\lo
cal\programs\python\python36\lib\site-packages (from dateparser->maya->steem)
...
Installing collected packages: urllib3, idna, chardet, certifi, requests, pycryp
to, funcy, w3lib, voluptuous, diff-MATCH-patch, scrypt, prettytable, appdirs, la
ngdetect, ruamel.yaml, humanize, tzlocal, regex, dateparser, pytzdata, pendulum,
maya, ecdsa, pylibscrypt, ujson, toolz, steem
Running setup.py install for pycrypto ... error
Complete output from command c:\users\***\appdata\local\programs\pytho
n\python36\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\
***~1\\AppData\\Local\\Temp\\pip-build-k6flhu5k\\pycrypto\\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\***N~1\AppDat
a\Local\Temp\pip-igpkll6u-record\install-record.txt --single-version-externally-
managed --compile:
running install
running build
running build_py
...
building 'Crypto.Random.OSRNG.winrandom' extension
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual
C++ Build Tools": http://landinghub.visualstudio.com/visual-cpp-build-tools
----------------------------------------
Command "c:\users\***\appdata\local\programs\python\python36\python.exe -u
-c "import setuptools, tokenize;__file__='C:\\Users\\***N~1\\AppData\\Local\\
Temp\\pip-build-k6flhu5k\\pycrypto\\setup.py';f=getattr(tokenize, 'open', open)(
__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code,   __fil
e__, 'exec'))" install --record C:\Users\***N~1\AppData\Local\Temp\pip-igpkll6
u-record\install-record.txt --single-version-externally-managed --compile"   faile
d with error code 1 in C:\Users\***N~1\AppData\Local\Temp\pip-build-    k6flhu5k\p
ycrypto\