def get_used_per_ticket_fields(self):
        files = self.folder.run_git_command(
            'ls-tree',
            '--name-only',
            self.revision
        ).split()
        fields = []

        for filename in files:
            matched = self.FIELD_MATCHER.match(filename)
            if matched:
                field_name = matched.group(1)
                if constants.FILE_FIELD_BLACKLIST not in field_name:
                    fields.append(field_name)

        return fields
dataset/ETHPy150Open coddingtonbear/jirafs/jirafs/jirafieldmanager.py/GitRevisionJiraFieldManager.get_used_per_ticket_fields/swapped operands of `not in`