'Deletes the specified policy document for the specified user.
:type user_name: string
:param user_name: The name of the user the policy is associated with.
:type policy_name: string
:param policy_name: The policy document to delete.'

def delete_user_policy(self, user_name, policy_name):

    params = {'UserName': user_name, 'PolicyName': policy_name}
    return self.get_response('DeleteUserPolicy', params, verb='POST')
