azure/datalake/store/multithread.py [144:153]:
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        self.lpath = lpath
        self._overwrite = overwrite
        existing_files = self._setup()
        if existing_files:
            raise FileExistsError('Overwrite was not specified and the following files exist, blocking the transfer operation. Please specify overwrite to overwrite these files during transfer: {}'.format(','.join(existing_files)))
        
        if run:
            self.run()

    def save(self, keep=True):
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azure/datalake/store/multithread.py [434:444]:
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        self.lpath = lpath
        self._overwrite = overwrite
        existing_files = self._setup()
        
        if existing_files:
            raise FileExistsError('Overwrite was not specified and the following files exist, blocking the transfer operation. Please specify overwrite to overwrite these files during transfer: {}'.format(','.join(existing_files)))

        if run:
            self.run()

    def save(self, keep=True):
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