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Write a python program to accept the sorting key from the user and display the sorted list of rollno and marks of 40 students of a class stored in a dictionary named score as key value pairs.
Answer:
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# Ask the user how they want to sort the data (by rollno or marks)
sort_key = input("How do you want to sort the data? According to rollno or marks? ")
# Ask the user if they want to sort the list in ascending or descending order
order = input("Enter True if you want to sort the list in ascending order else enter False ")
# Convert the order input to a boolean value
order = order.lower() == "true"
# Check if the user wants to sort by rollno
if sort_key == "rollno":
# Sort the dictionary by rollno using the sorted function and the keys method
sorted_score = sorted(score.keys(), reverse=not order)
# Print the header for the output
print("\nRoll no\tMarks")
# Loop through the sorted rollnos and print the corresponding marks
for k in sorted_score:
print(str(k) + '\t' + str(score[k]))
# Check if the user wants to sort by marks
elif sort_key == "marks":
# Sort the dictionary by marks using the sorted function and the values method
sorted_score = sorted(score.values(), reverse=not order)
# Print the header for the output
print("\nMarks\tRoll no")
# Loop through the sorted marks and print the corresponding rollnos
for k in sorted_score:
# Find the rollno that has the same mark as k using the index method
rollno = list(score.keys())[list(score.values()).index(k)]
print(str(k) + '\t' + str(rollno))
# If the user enters an invalid sort key, print an error message
else:
print("Invalid sort key. Please enter either rollno or marks.")
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