Fix result print for SamplingVQE & QAOA - fixes #58 (#65)

Co-authored-by: Elena Peña Tapia <[email protected]>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

qiskit_algorithms/minimum_eigensolvers/sampling_mes.py

@@ -123,15 +123,3 @@ def best_measurement(self) -> Mapping[str, Any] | None:
     def best_measurement(self, value: Mapping[str, Any]) -> None:
         """Set the best measurement over the entire optimization."""
         self._best_measurement = value
-
-    def __str__(self) -> str:
-        """Return a string representation of the result."""
-        disp = (
-            "SamplingMinimumEigensolverResult:\n"
-            + f"\tEigenvalue: {self.eigenvalue}\n"
-            + f"\tBest measurement\n: {self.best_measurement}\n"
-        )
-        if self.aux_operators_evaluated is not None:
-            disp += f"\n\tAuxiliary operator values: {self.aux_operators_evaluated}\n"
-
-        return disp

releasenotes/notes/update_sampling_result-6f65d2c54d7a88c3.yaml

@@ -0,0 +1,9 @@
+---
+other:
+  - |
+    Removed the custom ``__str__`` method from :class:`.SamplingMinimumEigensolverResult`
+    so that string conversion is based on the method of its parent :class:`.AlgorithmResult`
+    which prints all the result fields in a dictionary like format. The overridden method
+    had only printed a select couple of fields, unlike when normally printing a result all fields
+    are shown, and the lack of fields expected to be shown caused confusion when printing
+    results derived from that, such as returned by :class:`.SamplingVQE` and :class:`.QAOA`.