What is an example of a practical use of a dictionary(map) in a Python 3 program?

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Ashutosh Singh

B.Tech tutor for IIT JEE Mains and 12 board - Maths & Physics.

Dictionary in python are used to store key-value pair. Now suppose their are 5 students in a class, having roll no. 1 to 5. Each have Maths, Physics & chemistry as subject. Now suppose we want to PROCESS this data, for example we want to arrange them in decreasing order of marks in Maths, i.e. student...
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Dictionary in python are used to store key-value pair. Now suppose their are 5 students in a class, having roll no. 1 to 5. Each have Maths, Physics & chemistry as subject. Now suppose we want to PROCESS this data, for example we want to arrange them in decreasing order of marks in Maths, i.e. student having highest marks marks in maths is at the top of the list. We can write this data in the following way d={1:[54,67,88], 2:[24,67,56], 3:[99,12,78], 4:[55,33,44], 5:[11,58,79]} # where first element of each list is marks of Maths f=sorted(d,key=d.get, reverse=True) for r in f: print(r, d[r][0]) # This gives the output of roll number of students with max to min marks in Maths # OUTPUT 3 99 4 55 1 54 2 24 5 11 I hope this helps you understand how we can use dictionaries in python. read less
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