linux(centos7) 安装python3

1.安装依赖包

yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel -y

2.官网下载源码

wget https://www.python.org/ftp/python/3.7.12/Python-3.7.12.tgz

3.解压编译

tar -zxvf Python-3.7.0.tgz
cd Python-3.7.0
./configure
make&&make install

配置国内源,没有文件自己创建

vi %HOME%/.pip/pip.conf
[global] 
trusted-host = mirrors.aliyun.com 
index-url = https://mirrors.aliyun.com/pypi/simple/

第4、5步可以不做,使用时用python3命令即可

4.软连接

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

5.配置yum python2.7

vim /usr/libexec/urlgrabber-ext-down

vi /usr/bin/yum

#将第一行修改
#! /usr/bin/python

改成

#! /usr/bin/python2.7

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