Can't connect to HTTPS URL because the SSL module is not available.

Try to run python but encountered this error:

[root@nbu773srv1 tmp]# python3 get-pip.py 

pip is configured with locations that require TLS/SSL, however the ssl module in Python is not available.

Could not fetch URL https://pypi.python.org/simple/pip/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available. - skipping

Requirement already up-to-date: pip in /usr/local/lib/python3.7/site-packages

Collecting wheel

  Could not fetch URL https://pypi.python.org/simple/wheel/: There was a problem confirming the ssl certificate: Can't connect to HTTPS URL because the SSL module is not available. - skipping

  Could not find a version that satisfies the requirement wheel (from versions: )

No matching distribution found for wheel

ENV: Python 3.7 + CentOS 7.4

Resolution:

1. Please confirm if you can find openssl & openssl-devel rpm from OS.

# rpm -qa |grep openssl

openssl-libs-1.0.2k-8.el7.x86_64

openssl-1.0.2k-8.el7.x86_64

xmlsec1-openssl-1.2.20-7.el7_4.x86_64

2. Install openssl-devel using yum

# yum install openssl-devel.x86_64 

Then check the result:

# rpm -qa |grep openssl

openssl-libs-1.0.2k-8.el7.x86_64

openssl-1.0.2k-8.el7.x86_64

openssl-devel-1.0.2k-8.el7.x86_64

xmlsec1-openssl-1.2.20-7.el7_4.x86_64

3. Modify the source installation file

vi /Modules/Setup

# Socket module helper for socket(2)

_socket socketmodule.c timemodule.c

# Socket module helper for SSL support; you must comment out the other

# socket line above, and possibly edit the SSL variable:

#SSL=/usr/local/ssl

_ssl _ssl.c \

-DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \

-L$(SSL)/lib -lssl -lcrypto

4. Finally, you need to compile the python again.

# make & make install

5. Now, you can use ssl in python 3.

[root@nbu773srv1 tmp]# python3

Python 3.7.0a4 (default, Feb  6 2018, 13:44:46)

[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)] on linux

Type "help", "copyright", "credits" or "license" for more information.

>>> import ssl

Reference: http://www.cnblogs.com/yuechaotian/archive/2013/06/03/3115472.html