The `UserDict.UserDict.__delitem__` method in Python is used to delete an item from a dictionary-like object. It is a built-in method of the `UserDict` module, which provides a dictionary-like interface. When called, this method allows the deletion of a specific key-value pair from the user-defined dictionary object. If the key is not present, a `KeyError` is raised. Deleting an item using this method will modify the dictionary and remove the key-value pair associated with the specified key.
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