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centos7 自带有 python,版本是python2.7
接下来我们手动安装python3,并且配置后可以并存使用。
[root@root ~]# whereis python
python: /usr/bin/python2.7 /usr/bin/python /usr/lib/python2.7 /usr/lib64/python2.7 /etc/python /usr/include/python2.7 /usr/share/man/man1/python.1.gz
[root@root ~]# cd /usr/bin/
[root@root bin]# ll python*
lrwxrwxrwx. 1 root root 7 2月 7 09:30 python -> python2
lrwxrwxrwx. 1 root root 9 2月 7 09:30 python2 -> python2.7
-rwxr-xr-x. 1 root root 7136 8月 4 2017 python2.7
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make
运行了以上命令以后,就安装了编译python3所用到的相关依赖
#运行这个命令添加epel扩展源
yum -y install epel-release
#安装pip
yum install python-pip
pip install wget
wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tar.xz
#解压
xz -d Python-3.6.4.tar.xz
tar -xf Python-3.6.4.tar
#进入解压后的目录,依次执行下面命令进行手动编译
cd Python-3.6.4
./configure prefix=/usr/local/python3
make && make install
# 如果出现can't decompress data; zlib not available这个错误,则需要安装相关库
#安装依赖zlib、zlib-devel
yum install zlib zlib
yum install zlib zlib-devel
如果最后没提示出错,就代表正确安装了,在/usr/local/目录下就会有python3目录
#将原来的链接备份
mv /usr/bin/python /usr/bin/python.bak
#添加python3的软链接
ln -s /usr/local/python3/bin/python3.6 /usr/bin/python
#测试是否安装成功了
python -V
vi /usr/bin/yum
把#! /usr/bin/python修改为#! /usr/bin/python2
vi /usr/libexec/urlgrabber-ext-down
把#! /usr/bin/python 修改为#! /usr/bin/python2
启动python2:
启动python3:
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