Centos7下安装python3

1. 安装依赖环境

# 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

2. 浏览器打开 https://www.python.org/ftp/python/ 查看最新的Python版本，标记为3.A.B

# wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz

3. 创建Python3的目录

# mkdir /usr/local/python3 

4. 解压下载文件并切换目录

# tar -zxvf Python-3.6.4.tgz

# cd Python-3.6.4

5. 执行

$ ./configure --prefix=/usr/local/python3 #出错原因：未安装gcc环境 yum install -y gcc

$ make && make install

6.添加环境变量

$ vim ~/.bashrc

export PYTHON_HOME=/usr/local/python3/bin

export PATH=$PATH:$PYTHON_HOME

$ source ./.bashrc

# 6. 创建Python3的软链接

# $ ln -s /usr/local/python3/bin/python3 /usr/bin/python3

# 7. 创建Pip3的软链接

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

8. 测试命令 python3 和 pip3

# python3

# pip3

安装保留了原python命令调用python2

大功告成