The `default_flow_style` attribute in the ruamel.yaml.YAML module is used to set the default formatting style for writing YAML files. When this attribute is set to `True`, the YAML output will be in the flow style, where sequences and mappings are written on a single line, separated by commas. If `default_flow_style` is set to `False`, the output will be in the block style, where sequences and mappings are written in an indented and multi-line format. By default, `default_flow_style` is set to `None`, which means ruamel.yaml will choose the style based on the content.
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