old_contents: import json
  from pathlib import Path
  
  
  
  class JSONFormatter(object):
      def __init__(self, env):
          pass
  
  
      def format_violations(self, violations):
          return json.dumps(self._normalize_violations(violations))
  
  
      def _normalize_violations(self, violations):
          line_number = lambda violation: violation['position']['line']
          sorted_violations = sorted(violations, key=line_number)
  
          normalized_violations = map(lambda violation: self._normalize_violation(violation),
                                      sorted_violations)
  
          return list(normalized_violations)
  
  
      def _normalize_violation(self, violation):
          return {
              'file_path': str(Path(violation['position']['path'])),
              'line_number': violation['position']['line'],
              'column_number': violation['position']['column'],
              'severity': violation['level'].name.lower(),
              'description': violation['description'],
              'policy_name': violation['name'],
              'reference': violation['reference'],
          }
  
new_contents: import json
  from pathlib import Path
  
  
  
  class JSONFormatter(object):
      def __init__(self, env):
          pass
  
  
      def format_violations(self, violations):
          return json.dumps(self._normalize_violations(violations))
  
  
      def _normalize_violations(self, violations):
          line_number = lambda violation: violation['position']['line']
          sorted_violations = sorted(violations, key=line_number)
  
          normalized_violations = map(self._normalize_violation, sorted_violations)
  
          return list(normalized_violations)
  
  
      def _normalize_violation(self, violation):
          return {
              'file_path': str(Path(violation['position']['path'])),
              'line_number': violation['position']['line'],
              'column_number': violation['position']['column'],
              'severity': violation['level'].name.lower(),
              'description': violation['description'],
              'policy_name': violation['name'],
              'reference': violation['reference'],
          }
  
subject: Remove unnecessary lambda