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"""Register a new object to be loaded on request.
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:param module_name: The python path to the module. Such as 'os.path'.
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None, get() will return the module itself.
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:param help: Help text for this entry. This may be a string or
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:param override_existing: If True, replace the existing object
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with the new one. If False, if there is already something
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registered with the same key, raise a KeyError