Drop support for Python 3.8

scripts/check_python.py

@@ -3,25 +3,28 @@ If the current installed Python version is not supported, prints an error
 message to stderr and returns 1
 """
 
-from __future__ import print_function  # noqa: UP010
+from __future__ import print_function
 
 import sys
 
+MIN_VERSION_TUPLE = (3, 9)
+
 
 def check_python():
-    if sys.version_info[:2] >= (3, 8):  # noqa: UP036
+    if sys.version_info[:2] >= MIN_VERSION_TUPLE:
         # supported
         return
     else:
         version_string = ".".join(str(_) for _ in sys.version_info[:3])
-        msg = (
-            """ERROR: Your Python version is: %s
-Galaxy is currently supported on Python >=3.8 .
+        min_version_string = ".".join(str(_) for _ in MIN_VERSION_TUPLE)
+        msg = """ERROR: Your Python version is: {}
+Galaxy is currently supported on Python >={} .
 To run Galaxy, please install a supported Python version.
 If a supported version is already installed but is not your default,
 https://docs.galaxyproject.org/en/latest/admin/python.html contains instructions
-on how to force Galaxy to use a different version."""  # noqa: UP031
-            % version_string
+on how to force Galaxy to use a different version.""".format(
+            version_string,
+            min_version_string,
         )
         print(msg, file=sys.stderr)
         raise Exception(msg)

scripts/common_startup.sh

@@ -14,7 +14,7 @@ SKIP_NODE=${GALAXY_SKIP_NODE:-0}
 INSTALL_PREBUILT_CLIENT=${GALAXY_INSTALL_PREBUILT_CLIENT:-0}
 NODE_VERSION=${GALAXY_NODE_VERSION:-"$(cat client/.node_version)"}
 : "${YARN_INSTALL_OPTS:=--network-timeout 300000 --check-files}"
-: "${GALAXY_CONDA_PYTHON_VERSION:=3.8}"
+: "${GALAXY_CONDA_PYTHON_VERSION:=3.9}"
 
 for arg in "$@"; do
     if [ "$arg" = "--skip-venv" ]; then
@@ -40,7 +40,7 @@ RMFILES="
     lib/pkg_resources.pyc
 "
 
-MIN_PYTHON_VERSION=3.8
+MIN_PYTHON_VERSION=3.9
 MIN_PIP_VERSION=20.3
 
 # return true if $1 is in $2 else false