index_of(self, key)
The key identifying the HDU. If key
is a tuple, it is of the form (name, ver)
where ver
is an EXTVER
value that must match the HDU being searched for.
If the key is ambiguous (e.g. there are multiple 'SCI' extensions) the first match is returned. For a more precise match use the (name, ver)
pair.
If even the (name, ver)
pair is ambiguous (it shouldn't be but it's not impossible) the numeric index must be used to index the duplicate HDU.
When key
is an HDU object, this function returns the index of that HDU object in the HDUList
.
If key
is an HDU object and it is not found in the HDUList
.
If an HDU specified by the key
that is an extension number, extension name, or a tuple of extension name and version is not found in the HDUList
.
Get the index of an HDU from the HDUList
.
Hover to see nodes names; edges to Self not shown, Caped at 50 nodes.
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.
All aboves nodes referred to, (or are referred from) current nodes; Edges from Self to other have been omitted (or all nodes would be connected to the central node "self" which is not useful). Nodes are colored by the library they belong to, and scaled with the number of references pointing them