linux下 python 版本查看和修改

1.linux的軟連接存放位置

cd /usr/bin

2.查看現有python的軟連接指向的版本

ls -al *python*

3.刪除舊的軟連接

rm python

4.建立新的軟連接

ln -s python3.6 python

5.查看軟連接版本

python -V

全部操作都在root用戶下執行

1.安裝編譯相關工具
yum -y groupinstall "Development tools"
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
yum install libffi-devel -y

2.下載安裝包解壓

cd #回到用戶目錄
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz
tar -xvJf Python-3.7.0.tar.xz

3.編譯安裝

mkdir /usr/local/python3 #創建編譯安裝目錄
cd Python-3.7.0
./configure --prefix=/usr/local/python3
make && make install

4.創建軟連接

ln -s /usr/local/python3/bin/python3 /usr/local/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/local/bin/pip3

ln -s /usr/local/python3/bin/python3 /usr/local/bin/python
ln -s /usr/local/python3/bin/pip3 /usr/local/bin/pip

mv /usr/bin/python /usr/bin/python.bak
ln -s /usr/local/python3/bin/python3 /usr/bin/python
mv /usr/bin/pip /usr/bin/pip.bak
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip

5.驗證是否成功
python3 -V
pip3 -V