centOS安装python3 以及解决 导入ssl包出错的问题

参考:

https://www.cnblogs.com/mqxs/p/9103031.html

https://www.cnblogs.com/cerutodog/p/9908574.html

确认环境 系统版本

openssl版本

[root@67 local]# openssl version
OpenSSL 1.0.2k-fips 26 Jan 2017

OPS,居然新安装的centOS系统自带的就是1.0.2版本,这是不是意味着我可以很轻松的安装好python,然后import ssl就不会报错,而不用再去额外配置openssl了呢

?期待的搓搓手(原因是python3需要要注意的地方是版本要1.02以上版本才能正常使用像requests之类的库)

为了避免后面报各种错,我们先把需要的信赖包安装上,再安装python3

执行完make&&make install之后，可能会出现这种报错：

“ModuleNotFound：No module named '_ctypes'”

这里需要执行：

yum install libffi-devel -y

安装python3.6可能使用的依赖

yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel gcc gcc-c++  openssl-devel

[root@67 local]# yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel gcc gcc-c++ openssl-devel
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Package 1:openssl-devel-1.0.2k-16.el7_6.1.x86_64 already installed and latest version
Package bzip2-devel-1.0.6-13.el7.x86_64 already installed and latest version
Package expat-devel-2.1.0-10.el7_3.x86_64 already installed and latest version
Package gdbm-devel-1.10-8.el7.x86_64 already installed and latest version
Package readline-devel-6.2-10.el7.x86_64 already installed and latest version
Package sqlite-devel-3.7.17-8.el7.x86_64 already installed and latest version
Package gcc-4.8.5-36.el7_6.2.x86_64 already installed and latest version
Package gcc-c++-4.8.5-36.el7_6.2.x86_64 already installed and latest version
Package 1:openssl-devel-1.0.2k-16.el7_6.1.x86_64 already installed and latest version
Nothing to do
[root@67 local]# yum install libffi-devel -y
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile

* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Package libffi-devel-3.0.13-18.el7.x86_64 already installed and latest version

下面开始安装,太紧张了
 

建立一个文件夹安装python3

mkdir /usr/local/python3

下载安装文件

下载
wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tgz

解压

tar -xf Python-3.6.2.tgz

进入目录

cd Python-3.6.2

安装python3 （要注意如果你的ssl也是指定目录安装的 --with要跟上路径）

./configure --prefix=/usr/local/python3 --with-ssl

编译,安装,这一步会花的时间长一点

make && make install

安装完成

创建软连接之前先验证一下环境

cd /usr/local/python3/bin/

cd /usr/bin

最后创建软连接

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

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

建立软链接后

接下来就是要验证的时候,太紧紧紧张了

验证通过了~ 激动呀 开心呀,上次在centOS6.5搞这一套流程,一直有问题,整了周五下午到凌晨3点,周六下午7点到凌晨1点,整个人都不好了.

居然重装一次系统就解决问题了.

centOS7.6 自带的openSSL版本就可以支持python3了,无须再做配置,这真是省了好多心呀