added checks for python3.8 or lower since ast_comments.unparse() needs python 3.9 or higher.

testing with python 3.8 would make the build fail tests, skipping it there.

freqtrade/commands/strategy_utils_commands.py

@@ -1,4 +1,5 @@
 import logging
+import sys
 import time
 from pathlib import Path
 from typing import Any, Dict
@@ -19,6 +20,12 @@ def start_strategy_update(args: Dict[str, Any]) -> None:
     :return: None
     """
 
+    if sys.version_info <= (3, 8):
+        print("This code requires Python 3.9 or higher. "
+              "We cannot continue. "
+              "Please upgrade your python version to use this command.")
+
+    else:
         config = setup_utils_configuration(args, RunMode.UTIL_NO_EXCHANGE)
 
         strategy_objs = StrategyResolver.search_all_objects(

tests/test_strategy_updater.py

@@ -1,9 +1,14 @@
 # pragma pylint: disable=missing-docstring, protected-access, invalid-name
 
+import sys
+
 from freqtrade.strategy.strategyupdater import StrategyUpdater
 
 
 def test_strategy_updater(default_conf, caplog) -> None:
+    if sys.version_info <= (3, 8):
+        print("skipped tests since python version is 3.8 or lower.")
+    else:
         instance_strategy_updater = StrategyUpdater()
         modified_code1 = instance_strategy_updater.update_code("""
     class testClass(IStrategy):