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Convert iterator to list to list before looping through moments in def insert #5820

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Aug 8, 2022
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Convert iterator to list to list before looping through moments in def insert #5820

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2 changes: 1 addition & 1 deletion cirq-core/cirq/circuits/circuit.py
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Expand Up @@ -2083,7 +2083,7 @@ def insert(
"""
# limit index to 0..len(self._moments), also deal with indices smaller 0
k = max(min(index if index >= 0 else len(self._moments) + index, len(self._moments)), 0)
for moment_or_op in ops.flatten_to_ops_or_moments(moment_or_operation_tree):
for moment_or_op in list(ops.flatten_to_ops_or_moments(moment_or_operation_tree)):
if isinstance(moment_or_op, Moment):
self._moments.insert(k, moment_or_op)
k += 1
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6 changes: 6 additions & 0 deletions cirq-core/cirq/circuits/circuit_test.py
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Expand Up @@ -187,6 +187,12 @@ def test_append_single():
c.append([cirq.X(a)])
assert c == cirq.Circuit([cirq.Moment([cirq.X(a)])])

c = cirq.Circuit(cirq.H(a))
c.append(c)
assert c == cirq.Circuit(
[cirq.Moment(cirq.H(cirq.NamedQubit('a'))), cirq.Moment(cirq.H(cirq.NamedQubit('a')))]
)


def test_append_control_key():
q0, q1, q2 = cirq.LineQubit.range(3)
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