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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def make_template_name(self, obj):
 """ Return the canonical template name for an object instance. This method converts Python-style class names (PEP 8's recommended CamelCase, aka CapWords) to lower_case_with_underscords. Here is an example with code: 'hello_world' """

        template_name = obj.__class__.__name__

        def repl(match):
            return '_' + match.group(0).lower()

        return re.sub('[A-Z]', repl, template_name)[1:]