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def open_write_stream(self, relpath, mode=None):
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"""See Transport.open_write_stream."""
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abspath = self._abspath(relpath)
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handle = osutils.open_file(abspath, 'wb')
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self._check_mode_and_size(abspath, handle.fileno(), mode)
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transport._file_streams[self.abspath(relpath)] = handle