具体流程
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查看当前系统默认python版本
python --version
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查看/安装python
- 安装python3
apt install python3
- 查看python3
whereis python3
- 安装python3
-
删除原有python2的软连接
sudo rm /usr/bin/python
-
新建python3的软连接
sudo ln -s /usr/bin/python3.5 /usr/bin/python
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现在重新查看默认的python版本
python --version
bash操作记录
cds@cds-virtual-machine:~$ python --version
Python 2.7.12
cds@cds-virtual-machine:~$ whereis python3.5
python3: /usr/bin/python3.5-config /usr/bin/python3.5m /usr/bin/python3 /usr/bin/python3.5m-config /usr/bin/python3.5 /usr/lib/python3 /usr/lib/python3.5 /etc/python3 /etc/python3.5 /usr/local/lib/python3.5 /usr/include/python3.5m /usr/include/python3.5 /usr/share/python3 /usr/share/man/man1/python3.1.gz
cds@cds-virtual-machine:~$ rm /usr/bin/python
rm: cannot remove '/usr/bin/python': Permission denied
cds@cds-virtual-machine:~$ sudo rm /usr/bin/python
cds@cds-virtual-machine:~$ ln -s /usr/bin/python
python2 python3 python3.5m-config python-config
python2.7 python3.5 python3-config
python2.7-config python3.5-config python3m
python2-config python3.5m python3m-config
cds@cds-virtual-machine:~$ sudo ln -s /usr/bin/python3.5 /usr/bin/python
cds@cds-virtual-machine:~$ python --version
Python 3.5.2