This Python-Script for Nuke written by Jan Oberhauser allows to make a basic-comp on the push of a button. It does not matter if it is a MultiChannel-EXR, One-Channel-EXR or any other File with just one-channel like TGA, TIF, JPEG, ...
The Script starts to look for the Channel-Names and if the file just has the 'rgba'-Channel it checks the file-names. Then it orders the Nodes, comps them with the nodes defined and also creates additional nodes. 
Example: It looks for the depth-Channel, then adds a Grade-Node, copies the channel into the depth-Channel of the main-tree and adds a zBlur-Node afterwards.
This is just a Basic-Setup. But it can get easily get changed and expended much more just for every need with changing a few variables. For example different setups for background. creatures, effects, ....
Download this script here:

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