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Use "raise from" in except blocks #415

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merged 1 commit into from
Sep 12, 2023
Merged

Use "raise from" in except blocks #415

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4 changes: 2 additions & 2 deletions circuit_knitting/cutting/cutting_experiments.py
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Original file line number Diff line number Diff line change
Expand Up @@ -182,15 +182,15 @@ def _get_mapping_ids_by_partition(
if isinstance(inst.operation, SingleQubitQPDGate):
try:
decomp_id = int(inst.operation.label.split("_")[-1])
except (AttributeError, ValueError):
except (AttributeError, ValueError) as ex:
raise ValueError(
"SingleQubitQPDGate instances in input circuit(s) must have their "
'labels suffixed with "_<id>", where <id> is the index of the cut '
"relative to the other cuts in the circuit. For example, all "
"SingleQubitQPDGates belonging to the same cut, N, should have labels "
' formatted as "<your_label>_N". This allows SingleQubitQPDGates '
"belonging to the same cut to be sampled jointly."
)
) from ex
decomp_ids.add(decomp_id)
subcirc_qpd_gate_ids[label].append([i])
subcirc_map_ids[label].append(decomp_id)
Expand Down
8 changes: 4 additions & 4 deletions circuit_knitting/cutting/cutting_reconstruction.py
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Expand Up @@ -115,11 +115,11 @@ def reconstruct_expectation_values(
num_qpd_bits = results_dict[label].metadata[
i * len(so.groups) + k
]["num_qpd_bits"]
except KeyError:
except KeyError as ex:
raise ValueError(
"The num_qpd_bits field must be set in each subexperiment "
"result metadata dictionary."
)
) from ex
else:
subsystem_expvals[k] += quasi_prob * _process_outcome(
num_qpd_bits,
Expand Down Expand Up @@ -159,10 +159,10 @@ def _process_outcome(
outcome = _outcome_to_int(outcome)
try:
qpd_outcomes = outcome & ((1 << num_qpd_bits) - 1)
except TypeError:
except TypeError as ex:
raise TypeError(
f"num_qpd_bits must be an integer, but a {type(num_qpd_bits)} was passed."
)
) from ex

meas_outcomes = outcome >> num_qpd_bits

Expand Down