重装系统，安装python3.7.5之后，使用pip3 install ipython时出现了报错信息： Can‘t connect to HTTPS URL because the SSL module is not available
1、cd 到Python-3.7.5目录下，重新编译安装
cd Python-3.7.5
./configure --prefix=/usr/local/python3.7.5
2、查看自己的openssl的版本，并升级一下
[root@CentOS7 Python-3.7.5]# openssl version
[root@CentOS7 Python-3.7.5]# mv /usr/bin/openssl /usr/bin/openssl.bak
[root@CentOS7 Python-3.7.5]# ln -sf /usr/local/openssl/bin/openssl /usr/bin/openssl
[root@CentOS7 Python-3.7.5]# echo "/usr/local/openssl/lib" >> /etc/ld.so.conf
[root@CentOS7 Python-3.7.5]# ldconfig -v
[root@CentOS7 Python-3.7.5]# openssl version
OpenSSL 1.1.1a 20 Nov 2018
查看openssl的安装目录，我这里是/usr/local/openssl
[root@CentOS7 Python-3.7.5]# whereis openssl
openssl: /usr/bin/openssl /usr/lib64/openssl /usr/include/openssl /usr/local/openssl /usr/share/man/man1/openssl.1ssl.gz
3、编译完成后先不要make，先修改Python源码包中ssl的参数，
打开源码解压目录中的 Modules/Setup ,
直接搜索 SSL= ，将SSL=后面的目录改为前面openssl的安装目录，并把下面三行的注释去掉。
[root@CentOS7 Python-3.7.5]# vim Modules/Setup
SSL=/usr/local/openssl
#_ssl _ssl.c # -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl # -L$(SSL)/lib -lssl -lcrypto
4、改完之后就在解压目录直接make就行了。
[root@CentOS7 Python-3.7.5]
[root@CentOS7 Python-3.7.5]# echo "export PATH=/usr/local/python3.7.5/bin:$PATH" >> ~/.bashrc
[root@CentOS7 Python-3.7.5]# source ~/.bashrc
[root@CentOS7 Python-3.7.5]# pip3 list
Package Version
---------- -------
pip 19.2.3
setuptools 41.2.0
WARNING: You are using pip version 19.2.3, however version 21.0.1 is available.
You should consider upgrading via the ‘pip install --upgrade pip‘ command.
5、安装你想要的东西 pip3 install ipython
ojbk!!!
借鉴：
https://www.cnblogs.com/itbsl/p/11275728.html
https://www.jb51.net/article/166688.htm