(Caused by SSLError("Can't connect to HTTPS URL because the SSL module is not available."))

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]# make && makeinstall

5、 最后一步

[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