MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier:
1._______
2._______,
3.delitem,
4.len, and
5.iter.

2 essential methods are missing from this ADT, rest are there. Fill in the missing methods by selecting one of the choices.

Question

MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier: 
1._______
2._______,
3.delitem,
4.len, and
5.iter.

2 essential methods are missing from this ADT, rest are there. Fill in the missing methods by selecting one of the choices.

BlackTom AI · Accepted Answer

We start by restating the question to ensure clarity: The MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier, which are labeled as 1. ___ and 2. ___, followed by 3. delitem, 4. len, and 5. iter. Two essential methods are missing from this Abstract Data Type (ADT); we must select the pair that fills in the blanks from the given options.

Option 1: '1.getitem, 2.setitem,'
This pairing suggests that the missing methods are __getitem__ and __setitem__, which are the standard methods for item access and item assignment in Python mappings. __getitem__ defines how to retrieve a value by key, and __setitem__ defines how to assign a value to a key. In the context of MutableMapping, these are indeed fundamental operations that a mapping typically needs to support beyond the existing implementations (like delitem for deletion, len for size, and iter for iteration). Therefore, this option aligns with the typical design of a mutable mapping interface, filling the two missing essential methods.

Option 2: '1.delitem, 2.setitem,'
Here the blanks would be filled by __delitem__ and __setitem__. While __delitem__ and __setitem__ are both relevant for a mutable mapping, the question already lists '3. delitem' as one of the existing behaviors, implying that delitem is already provided by the ADT. Repeating delitem as a missing method would be redundant and inconsistent with the prompt, which indicates two different missing methods beyond what's already present. This makes this option unlikely to be the correct two missing methods.

Option 3: '1.balanceitem, 2.rotateitem,'
The terms balanceitem and rotateitem do not correspond to standard methods in the Python Mapping protocol. A MutableMapping focuses on item access, assignment, deletion, length, and iteration. Introducing terms like balanceitem or rotateitem would be non-idiomatic and unsupported by the conventional mapping interface. This makes this option implausible as the missing pair.

Option 4: '1.get_heightitem, 2.priority_queue_item,'
Similar to Option 3, these names do not reflect any recognized or conventional methods in the MutableMapping protocol. They imply data-structure-specific operations not aligned with the typical mapping semantics. This option is not consistent with the expected two core missing methods for a mapping type.

Synthesis: Among the choices, Option 1 ('1.getitem, 2.setitem,') best matches the standard responsibilities of a mutable mapping. __getitem__ and __setitem__ are the primary access and mutation operations that a mutable mapping must implement, complementing the existing delitem, len, and iter methods. The other options propose methods that either duplicate an existing operation (delitem) or refer to non-standard or unrelated operations that do not fit the Mapping protocol.

Taken together, the reasoning indicates that the correct pair to fill the blanks is __getitem__ and __setitem__, corresponding to '1.getitem, 2.setitem,' in the provided options.

MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier: 1._ 2._, 3.delitem, 4.len, and 5.iter. 2 essential methods are missing from this ADT, rest are there. Fill in the missing methods by selecting one of the choices.

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MutableMapping class provides concrete implementations for all behaviors other than the first five outlined earlier: 1._______ 2._______, 3.delitem, 4.len, and 5.iter. 2 essential methods are missing from this ADT, rest are there. Fill in the missing methods by selecting one of the choices.