deprecate support for running EasyBuild with Python < 3.9

Author: boegel

easybuild/main.py

@@ -90,6 +90,19 @@
 _log = None
 
 
+if sys.version_info < (3, 100):
+    full_py_ver = '.'.join(str(x) for x in sys.version_info[:3])
+    warning_lines = [
+        "\033[1;33m"
+        "WARNING: Running EasyBuild with Python < 3.9 is deprecated (you are using Python %s)" % full_py_ver,
+        '',
+        "You should use a more recent Python version to run EasyBuild with,",
+        "see https://docs.easybuild.io/installation/#more_pip_env_EB_PYTHON for more information."
+        "\033[0m"
+    ]
+    sys.stderr.write('\n' + '\n'.join(warning_lines) + '\n\n')
+
+
 def find_easyconfigs_by_specs(build_specs, robot_path, try_to_generate, testing=False):
     """Find easyconfigs by build specifications."""
     generated, ec_file = obtain_ec_for(build_specs, robot_path, None)