Add Python 3.9 support (Qiskit#1071)

* Add Python 3.9 support

This commit adds official python 3.9 support to qiskit-aer. This
includes CI, release notes, and package metadata.

Fixes Qiskit#1067

* Remove wheel job 3.9 skip

* Remove unused assertNoLogs method

The assertNoLogs methods was built using a private class from python's
stdlib unittest library. This should never have been done as it's
explicitly marked as private. Accordingly in Python 3.9 this private
class has been removed and no longer exists. It turns out this method
was not used anywhere in all of qiskit (the same identical code was
removed from terra as part of Qiskit/qiskit#5189 in
Qiskit/qiskit@ed5155b).
Since the implementation is not sound and nothing uses it this commit
just removes the class and method.

* Fix azure pipelines job matrix typo

Co-authored-by: Victor Villar <vvilpas@gmail.com>

.github/workflows/build.yml

@@ -70,12 +70,12 @@ jobs:
         with:
           python-version: 3.8
       - name: Install deps
-        run: python -m pip install -U cibuildwheel==1.7.0
+        run: python -m pip install -U cibuildwheel==1.7.1
       - name: Build Wheels
         env:
           CIBW_BEFORE_ALL_LINUX: "yum install -y https://archives.fedoraproject.org/pub/archive/epel/6/x86_64/epel-release-6-8.noarch.rpm && yum install -y openblas-devel"
           CIBW_BEFORE_BUILD: "pip install -U virtualenv pybind11"
-          CIBW_SKIP: "cp27-* cp34-* cp35-* cp39-* pp*"
+          CIBW_SKIP: "cp27-* cp34-* cp35-* pp*"
           CIBW_MANYLINUX_X86_64_IMAGE: "quay.io/pypa/manylinux2010_x86_64:2020-12-03-912b0de"
           CIBW_MANYLINUX_I686_IMAGE: "quay.io/pypa/manylinux2010_i686:2020-12-03-912b0de"
           CIBW_TEST_COMMAND: "python3 {project}/tools/verify_wheels.py"

.github/workflows/deploy.yml

@@ -18,7 +18,7 @@ jobs:
           python-version: '3.7'
       - name: Install cibuildwheel
         run: |
-          python -m pip install cibuildwheel==1.5.5
+          python -m pip install cibuildwheel==1.7.1
       - name: Build wheels
         env:
           CIBW_BEFORE_ALL_LINUX: "yum install -y https://archives.fedoraproject.org/pub/archive/epel/6/x86_64/epel-release-6-8.noarch.rpm && yum install -y openblas-devel"
@@ -74,7 +74,7 @@ jobs:
           python-version: '3.7'
       - name: Install cibuildwheel
         run: |
-          python -m pip install cibuildwheel==1.5.5
+          python -m pip install cibuildwheel==1.7.1
       - name: Build wheels
         env:
           CIBW_BEFORE_ALL: "yum install -y yum-utils wget && wget https://developer.download.nvidia.com/compute/cuda/10.1/Prod/local_installers/cuda-repo-rhel6-10-1-local-10.1.243-418.87.00-1.0-1.x86_64.rpm && rpm -i cuda-repo-rhel6-10-1-local-10.1.243-418.87.00-1.0-1.x86_64.rpm && yum clean all && yum -y install cuda-10-1 && yum install -y https://archives.fedoraproject.org/pub/archive/epel/6/x86_64/epel-release-6-8.noarch.rpm"

.github/workflows/tests_linux.yml

@@ -42,7 +42,7 @@ jobs:
     needs: ["lint"]
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         platform: [
           { os: "ubuntu-latest", python-architecture: "x64" },
         ]
@@ -86,7 +86,7 @@ jobs:
     timeout-minutes: 25
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         os: ["ubuntu-latest"]
     env:
       AER_THRUST_BACKEND: OMP

.github/workflows/tests_mac.yml

@@ -42,7 +42,7 @@ jobs:
     needs: ["lint"]
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         platform: [
           { os: "macOS-latest",   python-architecture: "x64"},
         ]
@@ -80,7 +80,7 @@ jobs:
     timeout-minutes: 25
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         os: ["macOS-latest"]
     env:
       AER_THRUST_BACKEND: OMP

.github/workflows/tests_windows.yml

@@ -43,7 +43,7 @@ jobs:
     timeout-minutes: 25
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
         os: ["windows-latest"]
     env:
       AER_THRUST_BACKEND: OMP

azure-pipelines.yml

@@ -140,6 +140,8 @@ stages:
               python.version: '3.7'
             Python38:
               python.version: '3.8'
+            Python39:
+              python.version: '3.9'
         variables:
           PIP_CACHE_DIR: $(Pipeline.Workspace)/.pip
         steps:
@@ -229,6 +231,8 @@ stages:
               python.version: '3.7'
             Python38:
               python.version: '3.8'
+            Python39:
+              python.version: '3.9'
         variables:
           PIP_CACHE_DIR: $(Pipeline.Workspace)/.pip
         steps:

releasenotes/notes/add-python3.9-83b3b4e5c3d59571.yaml

@@ -0,0 +1,10 @@
+---
+features:
+  - |
+    Python 3.9 support has been added in this release. You can now run Qiskit
+    Aer using Python 3.9 without building from source.
+deprecations:
+  - |
+    Python 3.6 support has been deprecated and will be removed in a future
+    release. When support is removed you will need to upgrade the Python
+    version you're using to Python 3.7 or above.

setup.py

@@ -116,6 +116,7 @@
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Topic :: Scientific/Engineering",
     ],
     python_requires=">=3.6",

test/terra/common.py

@@ -86,14 +86,6 @@ def _get_resource_path(filename, path=Path.TEST):
         """
         return os.path.normpath(os.path.join(path.value, filename))
 
-    def assertNoLogs(self, logger=None, level=None):
-        """
-        Context manager to test that no message is sent to the specified
-        logger and level (the opposite of TestCase.assertLogs()).
-        """
-        # pylint: disable=invalid-name
-        return _AssertNoLogsContext(self, logger, level)
-
     def assertSuccess(self, result):
         """Assert that simulation executed without errors"""
         success = getattr(result, 'success', False)
@@ -312,32 +304,6 @@ def assertDictAlmostEqual(self, dict1, dict2, delta=None, msg=None,
         raise self.failureException(msg)
 
 
-class _AssertNoLogsContext(unittest.case._AssertLogsContext):
-    """A context manager used to implement TestCase.assertNoLogs()."""
-
-    # pylint: disable=inconsistent-return-statements
-    def __exit__(self, exc_type, exc_value, tb):
-        """
-        This is a modified version of TestCase._AssertLogsContext.__exit__(...)
-        """
-        self.logger.handlers = self.old_handlers
-        self.logger.propagate = self.old_propagate
-        self.logger.setLevel(self.old_level)
-        if exc_type is not None:
-            # let unexpected exceptions pass through
-            return False
-
-        if self.watcher.records:
-            msg = 'logs of level {} or higher triggered on {}:\n'.format(
-                logging.getLevelName(self.level), self.logger.name)
-            for record in self.watcher.records:
-                msg += 'logger %s %s:%i: %s\n' % (record.name, record.pathname,
-                                                  record.lineno,
-                                                  record.getMessage())
-
-            self._raiseFailure(msg)
-
-
 def _is_ci_fork_pull_request():
     """
     Check if the tests are being run in a CI environment and if it is a pull

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.1
-envlist = py36, py37, py38, lint
+envlist = py36, py37, py38, py39, lint
 skipsdist = True
 
 [testenv]