Anaconda + pycharm know almost bigwigs are recommended standard Python, Anaconda has many versions, as of November 2019 is the latest version of the built-in Anaconda is Python3.7.5.
Pit came, many integrated environment is not a new version of the more the better --conda also do so. Because the python developers will inevitably come into contact with tensorflow, but for now, tensorflow support is python3.5 and 3.6, does not support python3.7, which is the latest version of Anaconda does not meet the potential demand for programmers.
And I pro-test, pip install tensorflow is version 2.0, import return pycharm run in "module not found" error, search in vain for a long time (too much food accounts for most). So determined to accept the recommendation, the historical version of anaconda install it, built the kind of python3.6.
如上图，conda3-5.3后就默认带python3.7了，所以就装了conda3-5.2.0版本。
清华镜像源：https://mirrors.tuna.tsinghua.edu.cn/anaconda/archive/