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Fix printing an empty PauliList (#7712) 

* add num.qubits check to be _truncated_str in pauli_list.py - Resolved Issue #7359

* new file:   fix-empty-string-pauli-list-init-4d978fb0eaf1bc70.yaml
	modified:   ../../test/python/quantum_info/operators/symplectic/test_pauli_list.py

* Added test to test_array_init to test array initialization for empty array

* Run black on test_pauli_list.py

* Update releasenotes/notes/fix-empty-string-pauli-list-init-4d978fb0eaf1bc70.yaml

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

Co-authored-by: John Lapeyre <jlapeyre@users.noreply.github.com>
Co-authored-by: Matthew Treinish <mtreinish@kortar.org>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
This commit is contained in:
Iman Elsayed 2022-09-16 09:50:02 -07:00 committed by GitHub
parent 02d2d6e705
commit 3ae23373e0
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3 changed files with 20 additions and 1 deletions
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2
qiskit/quantum_info/operators/symplectic/pauli_list.py
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@ -192,7 +192,7 @@ class PauliList(BasePauli, LinearMixin, GroupMixin):
def _truncated_str(self, show_class):
stop = self._num_paulis
if self.__truncate__:
if self.__truncate__ and self.num_qubits > 0:
max_paulis = self.__truncate__ // self.num_qubits
if self._num_paulis > max_paulis:
stop = max_paulis

11
releasenotes/notes/fix-empty-string-pauli-list-init-4d978fb0eaf1bc70.yaml Normal file
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@ -0,0 +1,11 @@
---
fixes:
- |
Fixed initialization of empty symplectic matrix in :meth:'PauliList.from_symplectic' in :class:'.PauliList' class
For example::
from qiskit.quantum_info.operators import PauliList
x = np.array([], dtype=bool).reshape((1,0))
z = np.array([], dtype=bool).reshape((1,0))
pauli_list = PauliList.from_symplectic(x, z)

8
test/python/quantum_info/operators/symplectic/test_pauli_list.py
View File

@ -80,6 +80,14 @@ class TestPauliListInit(QiskitTestCase):
def test_array_init(self):
"""Test array initialization."""
# Matrix array initialization
with self.subTest(msg="Empty array"):
x = np.array([], dtype=bool).reshape((1, 0))
z = np.array([], dtype=bool).reshape((1, 0))
pauli_list = PauliList.from_symplectic(x, z)
np.testing.assert_equal(pauli_list.z, z)
np.testing.assert_equal(pauli_list.x, x)
with self.subTest(msg="bool array"):
z = np.array([[False], [True]])
x = np.array([[False], [True]])