The original constraint was added in gh-505, at a time when Aer was
specifically requiring jupyter_sphinx in its own requirements-dev.txt
under certain constraints. The constraint no longer appears to be
needed, so all it serves to do now is to cause the docs build to fail on
Python 3.9.
Details and comments
While Ignis is still in the metapackage, its docs need to be able to build under its constraints. This PR is part of Qiskit/qiskit#1400, updating the dependencies of the docs build, and is effectively the same as Qiskit/qiskit-aer#1429.
Summary
The original constraint was added in gh-505, at a time when Aer was specifically requiring jupyter_sphinx in its own
requirements-dev.txtunder certain constraints. The constraint no longer appears to be needed, so all it serves to do now is to cause the docs build to fail on Python 3.9.Details and comments
While Ignis is still in the metapackage, its docs need to be able to build under its constraints. This PR is part of Qiskit/qiskit#1400, updating the dependencies of the docs build, and is effectively the same as Qiskit/qiskit-aer#1429.