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-rw-r--r--peekaboo/ruleset/engine.py8
1 files changed, 6 insertions, 2 deletions
diff --git a/peekaboo/ruleset/engine.py b/peekaboo/ruleset/engine.py
index 90c83f2..96af1c6 100644
--- a/peekaboo/ruleset/engine.py
+++ b/peekaboo/ruleset/engine.py
@@ -99,8 +99,12 @@ class RulesetEngine(object):
# check for unknown config sections by using rule names as rules'
# config section names. Allow all known rules not only the enabled ones
# because some might be temporarily disabled but should be allowed to
- # retain their configuration.
- self.config.check_sections(['rules'] + known_rule_names)
+ # retain their configuration. Use += extension of list to avoid
+ # 'TypeError: can only concatenate list (not "dict_keys") to list' with
+ # python3.
+ known_sections = ['rules']
+ known_sections += known_rule_names
+ self.config.check_sections(known_sections)
# have enabled rules check their configuration
for rule in self.enabled_rules: