fileobj_closed(f)
Returns False for all other types of objects, under the assumption that they are file-like objects with no sense of a 'closed' state.
Returns True if the given file-like object is closed or if f is a string (and assumed to be a pathname).
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Using a canvas is more power efficient and can get hundred of nodes ; but does not allow hyperlinks; , arrows or text (beyond on hover)
SVG is more flexible but power hungry; and does not scale well to 50 + nodes.
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