Centos7编译安装Python3

CentOS 7默认自带了python 2.7，没有3.x，自己动手来安装，n次遇坑，记录一下，供参考:

rpm包安装：

yum update
sudo yum install yum-utils
sudo yum groupinstall development
sudo yum install https://centos7.iuscommunity.org/ius-release.rpm
sudo yum install python36u
(自己测试最多只能到3.6，因此后面又尝试了编译安装3.7)

编译安装


1. 安装编译 Python3的相关包

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

2. 安装pip(CentOS没有pip)

# 添加 epel 扩展源

yum -y install epel-release

# 安装 pip

yum install python-pip

# 安装pip3

yum install -y python3-pip

3. 安装 wget

yum install wget

4. 下载 python3.7的源码包

# wget https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tgz

5. 编译生成python解释器

# 解压缩

tar -zxvf Python-3.7.2.tgz

# 进入解压后的目录

cd Python-3.7.2

# 依次执行下面命令进行手动编译

./configure prefix=/usr/local/python3

make && make install

6. 添加软链接

# 删除原来的 python 软链接

rm /usr/bin/python

# 添加 python 的软链接

ln -s /usr/local/python3/bin/python3.7 /usr/bin/python

# 添加 python3 的软链接

ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3.7

# 添加 pip3 的软链接

ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3.7

# 测试是否安装成功了

python -V

如果在使用pip过程中出现：
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.

则需要安装openssl