SSL module is missing when installing Python packages in QGIS with the new osgeo4w installer

Question

I'm trying to install a third party python package in a QGIS plugin with the following code:

import sys
import platform
import subprocess
try:
 import matplotlib
except ModuleNotFoundError:
 print('installing matplotlib')
 if platform.system() == 'Windows':
 subprocess.call([sys.exec_prefix + '/python', "-m", 'pip', 'install', 'matplotlib'])
 else:
 subprocess.call(['python3', '-m', 'pip', 'install', 'matplotlib'])

This code snipped have worked previously but with the new(?) OSGeo4W package it fails since the SSL module is not loaded? The error message looks like this:

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

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError("Can't connect to HTTPS URL because the SSL module is not available.")': /simple/matplotlib/

Is it a bug or some intended change?

• TSJ: Did you find an answer to this question?
• axel_ande: No, now I guide my users of the plugin to manually install instead :(

Answer 1

I was able to solve this, but I did a lot of things, and am not sure what all contributed to the solution. However, I think the following step is all you need to do.

Use the osgeo4w setup (advanced install, and in administrator mode) to install the openssl module. enter image description here I ran everything in the advanced installer that was on by default, but I think you could specify only the OpenSSL package.

• axel_ande: Hi, no the openssl module did not solve it for me (I think it was installed by default, or it at least installed now but it doesn't work for me :( )
• Abs_0_: same for me, but I did with a non-admin user.