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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 qmed_all_methods(self):
 """ Returns a dict of QMED methods using all available methods. Available methods are defined in :attr:`qmed_methods`. The returned dict keys contain the method name, e.g. `amax_record` with value representing the corresponding QMED estimate in m³/s. :return: dict of QMED estimates :rtype: dict """

        result = {}
        for method in self.methods:
            try:
                result[method] = getattr(self, '_qmed_from_' + method)()
            except:
                result[method] = None
        return result