Missing tweedledum as required package #6333
Description
Information
- Qiskit Terra version: 0.17.0
- Python version: 3.8.8
- Operating system: linux
What is the current behavior?
qiskit.circuit.classicalfunction.BooleanExpression fails with message that the tweedledum library is required. However, tweedledum is not listed a requirement for the qiskit-terra package.
Steps to reproduce the problem
Use API's that instantiate the BooleanExpression class. E.g.
from qiskit.circuit.library import PhaseOracle
oracle = PhaseOracle('x & ~y')
Leads to error:
Traceback (most recent call last):
File "<ipython-input-97-28069418327a>", line 3, in <module>
oracle = PhaseOracle('x & ~y') # previous API: qiskit.aqua.components.oracles.LogicalExpressionOracle
File "/opt/conda/lib/python3.8/site-packages/qiskit/circuit/library/phase_oracle.py", line 55, in __init__
expression = BooleanExpression(expression)
File "/opt/conda/lib/python3.8/site-packages/qiskit/circuit/classicalfunction/boolean_expression.py", line 39, in __init__
raise MissingOptionalLibraryError(
MissingOptionalLibraryError: "The 'tweedledum' library is required to use 'BooleanExpression compiler'. You can install it with 'pip install tweedledum'."
What is the expected behavior?
No error about missing library should happen.
Suggested solutions
Add tweedledum to ./requirements.txt.
Related to #5853 and #5830 where tweedledum is present in ./requirements-dev.txt, but not added to ./requirements.txt