| Class | Interface | Undocumented |
| Class | Attribute | Undocumented |
| Function | implements | Undocumented |
| Class | AlreadyImplementedError | Called when a utility already exists.
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| Class | _UtilityHandler | Undocumented |
| Function | provide_utility | Set the utility for the named interface. If the utility is already
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| Function | get_utility | Get the utility for the named interface. If the utility is not
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| Function | remove_utility | Remove the utility provided for an interface
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