ubuntu 下python環境的切換使用

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下建立的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
", "
", "
credits"or
"license
"for
more information.
>>>exit()
dsp@dsp-system-product-name:~/caffe-ssd$ activate py3.5bash: /home/dsp/anaconda3/bin/activate: 許可權不夠
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
", "
", "
credits"or
"license
"for more information.

-當我們將：/home/dsp/anaconda3/bin新增到環境變數中時，用python命令得到時anaconda下的python環境；

然後如果時env環境，直接進入建立的虛擬環境即可；

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

- 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

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