code refactoring

marymorstan/marymorstan.py

@@ -103,8 +103,7 @@ class MaryMorstan():
         ea_space.set_parameters(ea_parameters)
 
         if (OPERATOR_DISTRIBUTION_STRATEGY.TIME_BASED_DISTRIBUTION in (ea_space.mutation_strategy,
-                                                                       ea_space.crossover_strategy)
-                and wall_time_optimization_seconds is None):
+                                                                       ea_space.crossover_strategy) and wall_time_optimization_seconds is None):
             raise Exception('Please specify wall_time_optimization_seconds parameters '
                             'if you plan to base your variation strategy on the time')