Added comments to A_Very_Big_Sum.py

HackerRank-A Very Big Sum/A_Very_Big_Sum.py

@@ -1,26 +1,35 @@
 #!/bin/python3
 
+# Import necessary modules
 import math
 import os
 import random
 import re
 import sys
-# Complete the aVeryBigSum function below.
+
+# Define a function called 'aVeryBigSum' that takes a list 'ar' as input and returns the sum of its elements
 def aVeryBigSum(ar):
-    sum = 0
-    for i in range(len(ar)):
-        sum+=ar[i]
-    return sum
+    sum = 0  # Initialize a variable 'sum' to store the total sum of elements in the list
+    for i in range(len(ar)):  # Loop through each element in the list using its index
+        sum += ar[i]  # Add the current element to the running sum
+    return sum  # Return the final sum after the loop finishes
 
 if __name__ == '__main__':
+    # Open a file for writing the output. The file path is specified in the 'OUTPUT_PATH' environment variable.
     fptr = open(os.environ['OUTPUT_PATH'], 'w')
 
+    # Read the number of elements in the array from the user input and store it in 'ar_count'
     ar_count = int(input())
 
+    # Read the elements of the array from the user input, split the input by whitespace, and convert each element to an integer.
+    # Create a list 'ar' containing these integers.
     ar = list(map(int, input().rstrip().split()))
 
+    # Call the 'aVeryBigSum' function with the 'ar' list as input, and store the result in 'result'
     result = aVeryBigSum(ar)
 
+    # Write the result to the output file and append a newline character at the end.
     fptr.write(str(result) + '\n')
 
+    # Close the output file.
     fptr.close()