• 如何在Anaconda的python和系統自帶的python之間切換

一般ubuntu下有三種python環境，1. 系統自帶python2,3;在/usr/bin路徑下；2. anaconda下安裝的python;3. anaconda下創建的env環境

dsp@dsp-System-Product-Name:~/caffe-ssd$ whereis python
python: /usr/bin/python3.6m /usr/bin/python2.7-config /usr/bin/python2.7 /usr/bin/python3.6 /usr/bin/python3.6m-config 
/usr/bin/python /usr/bin/python3.6-config /usr/lib/python3.7 /usr/lib/python2.7 /usr/lib/python3.6 /etc/python2.7 
 
/etc/python3.6 /etc/python /usr/local/lib/python2.7 /usr/local/lib/python3.6 /usr/include/python3.6m /usr/include/python2.7 
/usr/include/python3.6 /usr/share/python /home/dsp/anaconda3/bin/python3.6m /home/dsp/anaconda3/bin/python3.6 
/home/dsp/anaconda3/bin/python3.6m-config /home/dsp/anaconda3/bin/python /home/dsp/anaconda3/bin/python3.6-config 
/usr/share/man/man1/python.1.gz
 

dsp@dsp-System-Product-Name:~/caffe-ssd$ python
Python 3.6.5 |Anaconda, Inc.| (default, Apr 29 2018, 16:14:56) 
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
dsp@dsp-System-Product-Name:~/caffe-ssd$ activate py3.5
bash: /home/dsp/anaconda3/bin/activate: 權限不夠
dsp@dsp
 
-System-Product-Name:~/caffe-ssd$ source activate py3.5
(py3.5) dsp@dsp-System-Product-Name:~/caffe-ssd$ python
Python 3.5.6 |Anaconda, Inc.| (default, Aug 26 2018, 21:41:56) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.

-當我們將：/home/dsp/anaconda3/bin添加到環境變量中時，用python命令得到時anaconda下的python環境；

然後如果時env環境，直接進入創建的虛擬環境即可；

dsp@dsp-System-Product-Name:~/caffe-ssd$ echo $PATH
/home/dsp/pycharm-community-2017.3.3/bin:/home/dsp/anaconda3/bin:/usr/local/cuda-9.0/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

- 如果時系統自帶的環境，python2,3切換: linux下切換python2和python3

- 或者，待驗證

python2切換到python3：
echo alias python=python3 >> ~/.bashrc
source ~/.bashrc
python3切換到python2：gedit  ~/.bashrc
# alias python=python3 
source ~/.bashrc

ubuntu 下python環境的切換使用