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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 getCheckerByName(self, checkerType):
 """ Get checker by given name. @checkerType: type of the checker """

        for checker in sum(list(self.linter._checkers.values()), []):
            if isinstance(checker, checkerType):
                return checker
        return None