Anaconda canda 安装 Python3 配置

链接：

1、安装Python 3.5以及tensorflow

以前用virtualenv觉得挺好用了，但是用多python版本下安装tensorflow，出现问题：

pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.
Collecting flask
Could not fetch URL https://pypi.python.org/simple/flask/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available. - skipping
Could not find a version that satisfies the requirement flask (from versions: )
No matching distribution found for flask

查看很多资料，参考，参考2，按照一些方式仍然不行，选择anaconda安装，很方便。

在次环境中安装tensorflow:

conda create --name python35 python=3.5(用3.6与pip安装的tensorflow不兼容)

source activate python35

pip install --upgrade tensorflow

2、回退Python 2.7

如果要退出Python 3.5环境，输入

source deactivate python35

可以看到系统退回Python 2.7环境