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PYTHON PROGRAM • LOOPS

Sum Natural Numbers in Python

Learn sum natural numbers in python with a short, executable Python example.

BeginnerforAccumulator

PROBLEM UNDERSTANDING

Input and expected output

Sample input
No input required
Sample output
55

COMPLETE PYTHON PROGRAM

Complete Python implementation

python-sum-natural.py
Open in compiler
total = 0
for number in range(1, 11):
    total += number
print(total)

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

Select Start to walk through the important lines.

SELECTED LINE

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EXPECTED OUTPUT FOR THE SAMPLE

55
0%Step 0 of 0

PROGRAM EXPLANATION

Algorithm and explanation

  1. Initialize the sample values used to sum natural numbers.
  2. Process the data step by step using for and Accumulator.
  3. Display the result for sum natural numbers and compare it with the documented sample output.

This example of sum natural numbers processes the sample values in a controlled iteration. It demonstrates for and Accumulator 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(1)

DEBUGGING CHECKLIST

Common mistakes

Check this

For sum natural numbers, keep the data shape and value types consistent with for.

Check this

Keep every dependent statement inside the correct indented Python block.

Check this

Verify the final for and Accumulator 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.