Given a Python dictionary d and a value v, it is efficient to find the corresponding key: d[k] = v.Question 27Select one:TrueFalse
Question
Given a Python dictionary d
and a value v
, it is efficient to find the corresponding key:
d[k] = v
Question 27
Select one:
- True
- False
Solution
Answer: False
Explanation:
In Python, dictionaries are designed for efficient key-value pair retrieval. However, in the scenario presented where you want to find the key corresponding to a given value (i.e., to perform the operation ), you must search through the entire dictionary to identify which key maps to the value . This operation is inefficient and has a time complexity of , where is the number of items in the dictionary, because it requires checking each key-value pair.
In contrast, accessing a value using its key (i.e., ) is an operation, which is efficient. Therefore, the assertion that it is efficient to find the corresponding key from a value is False.
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