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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 __assert_true(returned):
        '''
        Test if an boolean is True
        '''
        result = "Pass"
        try:
            assert (returned is True), "{0} not True".format(returned)
        except AssertionError as err:
            result = "Fail: " + six.text_type(err)
        return result