Computer Science
Assertion. Dictionaries are mutable but their keys are immutable.
Reason. The values of a dictionary can change but keys of dictionary cannot be changed because through them data is hashed.
Answer
(a)
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Explanation
A dictionary is a unordered set of key : value pairs and are indexed by keys. The values of a dictionary can change but keys of dictionary cannot be changed because through them data is hashed. Hence dictionaries are mutable but keys are immutable and unique.
Related Questions
Assertion. Modifying a string creates another string internally but modifying a list does not create a new list.
Reason. Strings are immutable types while lists are mutable types of python.
Assertion. Dictionaries are mutable, hence its keys can be easily changed.
Reason. Mutability means a value can be changed in place without having to create new storage for the changed value.
Assertion. In Insertion Sort, a part of the array is always sorted.
Reason. In Insertion sort, each successive element is picked and inserted at an appropriate position in the sorted part of the array.
What is the internal structure of python strings ?