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PYTHON PROGRAM • LISTS

Find the Second Largest List Value in Python

Learn find the second largest list value in python with a short, executable Python example.

Beginnerset()sorted()List

PROBLEM UNDERSTANDING

Input and expected output

Sample input
No input required
Sample output
7

COMPLETE PYTHON PROGRAM

Complete Python implementation

python-second-largest-list.py
Open in compiler
values = [9, 2, 7, 9, 5]
unique = sorted(set(values), reverse=True)
print(unique[1])

GUIDED CODE TOUR • NOT LIVE EXECUTION

Study the program line by line

Use the real compiler button above to run and debug with different inputs.

CURRENT STEP

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SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

7
0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

  1. Initialize the sample values used to find the second largest list value.
  2. Apply set() and sorted() to compute the required result.
  3. Display the result for find the second largest list value and compare it with the documented sample output.

This example of find the second largest list value computes the result directly from the prepared sample data. It demonstrates set(), sorted(), and List and prints a deterministic result that can be checked against the sample output.

EFFICIENCY

Time and space complexity

Time complexity

O(n)

Auxiliary space

O(n)

DEBUGGING CHECKLIST

Common mistakes

Check this

For find the second largest list value, keep the data shape and value types consistent with set().

Check this

Apply set() in the same order shown by the algorithm; changing the order can change the result.

Check this

Verify the final set() and sorted() result against the sample before trying new data.

Try it yourself

Practice: Run the program with the sample input, predict its output, and then test one boundary case of your own.