Anaconda under ubuntu solves the coexistence problem of python2 and python3

Reprinted from https://blog.csdn.net/u010801439/article/details/79485914

First of all, what everyone needs to understand is that under the original ubuntu system, there is a python environment. However, in order to have different needs in different periods, sometimes, python2 is required, but in some cases, it is necessary to use python3, then, how can I switch freely under the ubuntu system, and quickly use the two versions of python2 and python3~ Next, I will introduce the usage method in detail.

First, prepare the documents:

在ubuntu 系统下安装好anaconda3（2）任意一个版本

Second, make sure conda or pip are up to date (or just update them)

更新pip:    pip install updata pip 
更新conda:  conda update conda 

Third, install multiple versions, switch (exit) multiple versions

Create an environment named py3 based on python3.6:

conda create --name py3 python=3.6

Then create an environment named py2 based on python2.7:

conda create --name py2 python=2.7

Activate the relevant environment (eg: py2):

激活py2：   source activate py2 
注销py2:    source deactivate py2