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This adds an utility function to compute a "sub-dictionnaries" to
dictutils.py
.I've worked on a project with @mdomke and he was adding a very similar function to all of his projects utility module. At first I thought "whatever dude..." But then I realized that it actually is a very useful function, and I ended up adding the same function to all my projects
utils.py
.I think this would be a very useful addition to boltons
Disclaimer: I wrote this function from scratch, just copying the function signature/API from @mdomke's original function. I made sure to use a different python style than him, so that no copyright infringement could be claimed. (Even though, I think @mdomke would not mind if I would've just had copy/pasted his original code.)