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I like Nick's original idea for a handful of convenience functions but want to caution against adding a bunch of tools that start guessing at what you want. Adding automatic wildcard expansion, shell quoting/splitting and whatnot can make the module more arcane and harder to learn and remember. 
Please adopt a conservation approach adding the minimal set that has been shown to be necessary. We can take these tools away if they turn out to have been a bad idea. It is much easier to add cruft than to take it away. In the itertools module, a number of tools started their life as just a recipe in the docs and only became builtin after having proved their worth and having proved their API.