[PATCH 7/7] Python: Drop support for Python 3.6

[John Snow]

Python 3.6 was EOL 2021-12-31. Newer versions of upstream libraries have
begun dropping support for this version and it is becoming more
cumbersome to support. Avocado-framework and qemu.qmp each have their
own reasons for wanting to drop Python 3.6.

Since it is safe to under our supported platform policy, do so.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/conf.py             |  4 ++--
 configure                |  8 ++++----
 python/Makefile          | 10 +++++-----
 python/setup.cfg         |  7 +++----
 python/tests/minreqs.txt |  2 +-
 scripts/qapi/mypy.ini    |  2 +-
 6 files changed, 16 insertions(+), 17 deletions(-)

diff --git a/docs/conf.py b/docs/conf.py
index 73a287a4f27..d40448f35d9 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -37,9 +37,9 @@
 # In newer versions of Sphinx this will display nicely; in older versions
 # Sphinx will also produce a Python backtrace but at least the information
 # gets printed...
-if sys.version_info < (3,6):
+if sys.version_info < (3,7):
     raise ConfigError(
-        "QEMU requires a Sphinx that uses Python 3.6 or better\n")
+        "QEMU requires a Sphinx that uses Python 3.7 or better\n")
 
 # The per-manual conf.py will set qemu_docdir for a single-manual build;
 # otherwise set it here if this is an entire-manual-set build.
diff --git a/configure b/configure
index bf512273f44..de27994ddc8 100755
--- a/configure
+++ b/configure
@@ -594,9 +594,9 @@ esac
 
 
 check_py_version() {
-    # We require python >= 3.6.
+    # We require python >= 3.7.
     # NB: a True python conditional creates a non-zero return code (Failure)
-    "$1" -c 'import sys; sys.exit(sys.version_info < (3,6))'
+    "$1" -c 'import sys; sys.exit(sys.version_info < (3,7))'
 }
 
 python=
@@ -604,7 +604,7 @@ first_python=
 explicit_python=no
 # A bare 'python' is traditionally python 2.x, but some distros
 # have it as python 3.x, so check in both places.
-for binary in "${PYTHON-python3}" python python3.{11..6}
+for binary in "${PYTHON-python3}" python python3.{11..7}
 do
     if has "$binary"
     then
@@ -1057,7 +1057,7 @@ then
 fi
 
 if ! check_py_version "$python"; then
-  error_exit "Cannot use '$python', Python >= 3.6 is required." \
+  error_exit "Cannot use '$python', Python >= 3.7 is required." \
              "Use --python=/path/to/python to specify a supported Python." \
              "Maybe try:" \
              "  openSUSE Leap 15.3+: zypper install python39" \
diff --git a/python/Makefile b/python/Makefile
index c5bd6ff83ac..f660d999143 100644
--- a/python/Makefile
+++ b/python/Makefile
@@ -9,14 +9,14 @@ help:
        @echo "make check-minreqs:"
        @echo "    Run tests in the minreqs virtual environment."
        @echo "    These tests use the oldest dependencies."
-       @echo "    Requires: Python 3.6"
-       @echo "    Hint (Fedora): 'sudo dnf install python3.6'"
+       @echo "    Requires: Python 3.7"
+       @echo "    Hint (Fedora): 'sudo dnf install python3.7'"
        @echo ""
        @echo "make check-tox:"
        @echo "    Run tests against multiple python versions."
        @echo "    These tests use the newest dependencies."
-       @echo "    Requires: Python 3.6 - 3.10, and tox."
-       @echo "    Hint (Fedora): 'sudo dnf install python3-tox python3.10'"
+       @echo "    Requires: Python 3.7 - 3.11, and tox."
+       @echo "    Hint (Fedora): 'sudo dnf install python3-tox python3.11'"
        @echo "    The variable QEMU_TOX_EXTRA_ARGS can be use to pass extra"
        @echo "    arguments to tox".
        @echo ""
@@ -58,7 +58,7 @@ pipenv check-pipenv:
 min-venv: $(QEMU_MINVENV_DIR) $(QEMU_MINVENV_DIR)/bin/activate
 $(QEMU_MINVENV_DIR) $(QEMU_MINVENV_DIR)/bin/activate: setup.cfg 
tests/minreqs.txt
        @echo "VENV $(QEMU_MINVENV_DIR)"
-       @python3.6 -m venv $(QEMU_MINVENV_DIR)
+       @python3.7 -m venv $(QEMU_MINVENV_DIR)
        @(                                                              \
                echo "ACTIVATE $(QEMU_MINVENV_DIR)";                    \
                . $(QEMU_MINVENV_DIR)/bin/activate;                     \
diff --git a/python/setup.cfg b/python/setup.cfg
index 9e923d97628..1e8392a045c 100644
--- a/python/setup.cfg
+++ b/python/setup.cfg
@@ -14,7 +14,6 @@ classifiers =
     Natural Language :: English
     Operating System :: OS Independent
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
@@ -23,7 +22,7 @@ classifiers =
     Typing :: Typed
 
 [options]
-python_requires = >= 3.6
+python_requires = >= 3.7
 packages =
     qemu.qmp
     qemu.machine
@@ -76,7 +75,7 @@ exclude = __pycache__,
 
 [mypy]
 strict = True
-python_version = 3.6
+python_version = 3.7
 warn_unused_configs = True
 namespace_packages = True
 warn_unused_ignores = False
@@ -158,7 +157,7 @@ multi_line_output=3
 # of python available on your system to run this test.
 
 [tox:tox]
-envlist = py36, py37, py38, py39, py310, py311
+envlist = py37, py38, py39, py310, py311
 skip_missing_interpreters = true
 
 [testenv]
diff --git a/python/tests/minreqs.txt b/python/tests/minreqs.txt
index dfb8abb155f..55cc6b41d85 100644
--- a/python/tests/minreqs.txt
+++ b/python/tests/minreqs.txt
@@ -1,5 +1,5 @@
 # This file lists the ***oldest possible dependencies*** needed to run
-# "make check" successfully under ***Python 3.6***. It is used primarily
+# "make check" successfully under ***Python 3.7***. It is used primarily
 # by GitLab CI to ensure that our stated minimum versions in setup.cfg
 # are truthful and regularly validated.
 #
diff --git a/scripts/qapi/mypy.ini b/scripts/qapi/mypy.ini
index 66253564297..3463307ddc7 100644
--- a/scripts/qapi/mypy.ini
+++ b/scripts/qapi/mypy.ini
@@ -1,7 +1,7 @@
 [mypy]
 strict = True
 disallow_untyped_calls = False
-python_version = 3.6
+python_version = 3.7
 
 [mypy-qapi.schema]
 disallow_untyped_defs = False
-- 
2.39.0