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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 path_placeholders(self):
 """ The formattable placeholders from this endpoint's path, in the order they appear. Example: ['foo', 'bar'] """


        parser = string.Formatter()
        return [placeholder_name for _, placeholder_name, _, _ in parser.parse(self.path) if placeholder_name]