deprecating Python 3.6

Author: bknueven

.github/workflows/egret.yml

@@ -26,7 +26,7 @@ jobs:
         strategy:
             matrix:
                 os: [ubuntu-latest]
-                python-version: [3.6, 3.7, 3.8, 3.9]
+                python-version: [3.7, 3.8, 3.9]
                 pyomo-version: [5.7.1]
                 pyutilib-version: [6.0.0]
                 include:

README.md

@@ -24,6 +24,7 @@ EGRET is available under the BSD License (see LICENSE.txt)
 
 ### Requirements
 
+* Python 3.7 or later
 * Pyomo version 5.7.1 or later
 * pytest
 * Optimization solvers for Pyomo - specific requirements depends on the models being solved. EGRET is tested with Gurobi or CPLEX for MIP-based problems (e.g., unit commitment) and Ipopt (with HSL linear solvers) for NLP problems.

setup.py

@@ -27,7 +27,8 @@
     'scripts': [],
     'include_package_data': True,
     'install_requires' : ['pyomo>=5.7.1', 'numpy', 'pytest', 'pandas', \
-                            'matplotlib', 'seaborn', 'scipy', 'networkx']
+                            'matplotlib', 'seaborn', 'scipy', 'networkx'],
+    'python_requires' : '>=3.7, <4',
 }
 
 setup(name=DISTNAME,