added check if solver was installed properly

doper/utility.py

@@ -158,6 +158,13 @@ def get_solver(solver, solver_dir=os.path.join(get_root(), 'solvers')):
     if system == 'Windows':
         return os.path.join(solver_dir, 'Windows'+bit, solver+'.exe')
     return os.path.join(solver_dir, 'Linux'+bit, solver)
+
+def check_solver(solver='cbc'):
+    sol = get_solver(solver)
+    if not os.path.exists(sol):
+        logging.warning(f'The default "cbc" solver was not properly installed at "{sol}". ' \
+                        + 'Need to manually set the "solver_path" and "solver_name" ' \
+                        + 'when calling DOPER')
 
 def extract_properties(parameter, tech_name, prop_name, set_list=None):
     '''

doper/wrapper.py

@@ -19,9 +19,14 @@
 import pandas as pd
 import pyutilib.subprocess.GlobalData
 
+from .utility import fix_bug_pyomo, check_solver, pyomo_read_parameter
+
 # Fix bug in pyomo when intializing solver (timeout after 5s)
-from .utility import fix_bug_pyomo, pyomo_read_parameter
 fix_bug_pyomo()
+
+# Check if solver was properly installed
+check_solver()
+
 from pyomo.opt import SolverFactory, TerminationCondition
 from .models.basemodel import default_output_list, generate_summary_metrics