em_framework/points: Add string representation to Experiment class (#297

)

* em_framework/points: Add string representation to Experiment class

* points: Add formal string representation __repr__ to Experiment class

.__repr__() provides the formal string representation of an object, aimed at the programmer.
.__str__() provides the informal string representation of an object, aimed at the user.

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

ema_workbench/em_framework/points.py

@@ -108,6 +108,16 @@ def __init__(self, name, model_name, policy, scenario, experiment_id):
         self.model_name = model_name
         self.scenario = scenario
 
+    def __repr__(self):
+        return (
+            f"Experiment(name={self.name!r}, model_name={self.model_name!r}, "
+            f"policy={self.policy!r}, scenario={self.scenario!r}, "
+            f"experiment_id={self.experiment_id!r})"
+        )
+
+    def __str__(self):
+        return f"Experiment {self.experiment_id} (model: {self.model_name}, policy: {self.policy.name}, scenario: {self.scenario.name})"
+
 
 class ExperimentReplication(NamedDict):
     """helper class that combines scenario, policy, any constants, and