def getFileVersion(self, pathId, fileId, version):
        for source in self.sources:
            try:
                return source.getFileVersion(pathId, fileId, version)
            # FIXME: there should be a better error for this
            except (KeyError, __HOLE__), e:
                continue
        return None
dataset/ETHPy150Open sassoftware/conary/conary/repository/trovesource.py/SourceStack.getFileVersion