2020-02-13 macos pip install 出现

参考文章： https://github.com/pypa/pip/issues/7254

**Steps to Fix**
in your terminal:

1.  brew update && brew upgrade && brew install openssl
    ##note: some people report that the dylib files needed in [#3](https://github.com/pypa/pip/issues/3) are in the 1.0.2t folder, rather than the lib folder. adjust your path in [#2](https://github.com/pypa/pip/issues/2) as needed.
2.  cd /usr/local/Cellar/openssl/1.0.2t/lib
3.  sudo cp libssl.1.0.0.dylib libcrypto.1.0.0.dylib /usr/local/lib/
4.  cd /usr/local/lib
5.  sudo ln -s libssl.1.0.0.dylib libssl.dylib
6.  sudo ln -s libcrypto.1.0.0.dylib libcrypto.dylib

其中 /usr/local/Cellar/openssl/1.0.2t/lib 目录可能因为使用mac 系统版本区别有所差异，需要在命令行窗口按tab自动补齐查找正确的目录， libssl.1.0.0.dylib libcrypto.1.0.0.dylib 版本号也可能不一致，请根据实际情况。我的是：

cd /usr/local/Cellar/openssl@1.1/1.1.1d/lib
sudo cp libssl.1.1.dylib libcrypto.1.1.dylib /usr/local/lib/
cd /usr/local/lib
sudo ln -s libssl.1.1.dylib libssl.dylib
sudo ln -s libcrypto.1.1.dylib libcrypto.dylib