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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
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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 v v (i.e., to perform the operation d[k]=v d[k] = v ), you must search through the entire dictionary to identify which key k k maps to the value v v . This operation is inefficient and has a time complexity of O(n) O(n) , where n n 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., d[k] d[k] ) is an O(1) O(1) 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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