qiskit/releasenotes/notes/0.18/improve-error-in-pauli-944a...

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---
upgrade:
- |
When creating a :class:`~qiskit.quantum_info.Pauli` object with an invalid
string label, a :class:`~qiskit.exceptions.QiskitError` is now raised.
This is a change from previous releases which would raise an
``AttributeError`` on an invalid string label. This change was made to
ensure the error message is more informative and distinct from a generic
``AttributeError``.