Note that Python 3.6+ is required

Author: akx

setup.py

@@ -29,6 +29,7 @@
     package_dir={'': 'src'},
     include_package_data=True,
     install_requires=requirements,
+    python_requires='>=3.6',
     license='Eclipse Public License v2.0 / Eclipse Distribution License v1.0',
     zip_safe=False,
     keywords='paho',