🎨 Stremline error handling

src/mqt/bench/output.py

@@ -76,7 +76,7 @@ def generate_header(
             "The Python package `mqt.bench` is not installed in the current "
             "environment. Install it with\n\n"
             "    pip install mqt.bench\n\n"
-            f"and try again. (Original error: {exc})"
+            "and try again."
         )
         raise MQTBenchExporterError(msg) from exc
 
@@ -155,7 +155,7 @@ def write_circuit(
                 destination.write(header)
                 (dump2 if fmt is OutputFormat.QASM2 else dump3)(qc, destination)
             except Exception as exc:  # pragma: no cover - unforeseen I/O
-                msg = f"Failed to write QASM stream. (Original error: {exc})"
+                msg = "Failed to write QASM stream."
                 raise MQTBenchExporterError(msg) from exc
             return
 
@@ -166,7 +166,7 @@ def write_circuit(
             try:
                 dump_qpy(_attach_metadata(qc, header), destination)
             except Exception as exc:
-                msg = f"Failed to write QPY stream. (Original error: {exc})"
+                msg = "Failed to write QPY stream."
                 raise MQTBenchExporterError(msg) from exc
             return
 
@@ -179,15 +179,15 @@ def write_circuit(
                 f.write(header)
                 (dump2 if fmt is OutputFormat.QASM2 else dump3)(qc, f)
         except Exception as exc:
-            msg = f"Failed to write {fmt.value.upper()} file to {destination}. (Original error: {exc})"
+            msg = f"Failed to write {fmt.value.upper()} file to {destination}."
             raise MQTBenchExporterError(msg) from exc
 
     elif fmt is OutputFormat.QPY:
         try:
             with destination.open("wb") as f:
                 dump_qpy(_attach_metadata(qc, header), f)
         except Exception as exc:
-            msg = f"Failed to write QPY file to {destination}. (Original error: {exc})"
+            msg = f"Failed to write QPY file to {destination}."
             raise MQTBenchExporterError(msg) from exc
 
     else:
@@ -220,7 +220,8 @@ def save_circuit(
     try:
         write_circuit(qc, path, level, output_format, target)
     except MQTBenchExporterError as e:
-        print(e)
+        cause = f": {e.__cause__}" if e.__cause__ else ""
+        print(f"{e}{cause}")
         return False
 
     return True

tests/test_bench.py

@@ -668,7 +668,8 @@ def test_generate_header_minimal(monkeypatch: pytest.MonkeyPatch) -> None:
     hdr = generate_header(OutputFormat.QASM3, BenchmarkLevel.INDEP)
     lines = hdr.splitlines()
     # first line has today's date
-    assert lines[0] == f"// Benchmark created by MQT Bench on {datetime.datetime.now(tz=datetime.timezone.utc).date()}"
+    today = datetime.datetime.now(tz=datetime.timezone.utc).date()
+    assert lines[0] == f"// Benchmark created by MQT Bench on {today}"
     # contains the fixed info lines
     assert "// For more info: https://mqt-bench.app/" in hdr
     assert "// MQT Bench version: 9.9.9" in hdr
@@ -756,9 +757,8 @@ def test_write_circuit_qpy(tmp_path: Path) -> None:
     assert isinstance(circ, QuantumCircuit)
 
     header = circ.metadata["mqt_bench"]
-    assert header.startswith(
-        f"// Benchmark created by MQT Bench on {datetime.datetime.now(tz=datetime.timezone.utc).date()}"
-    )
+    today = datetime.datetime.now(tz=datetime.timezone.utc).date()
+    assert header.startswith(f"// Benchmark created by MQT Bench on {today}")
     assert "// MQT Bench version:" in header
     assert "// Output format: qpy" in header