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#!/usr/bin/env python3
import csv
import sys
from itertools import islice
def sum_csv_line(filename, line_number):
"""Return the sum of a specific line in a CSV file."""
try:
with open(filename, newline="") as file:
reader = csv.reader(file)
row = next(islice(reader, line_number - 1, None))
# Convert values to float and sum
return sum(float(x) for x in row)
except StopIteration:
raise ValueError(f"Line {line_number} exceeds file length")
except ValueError as e:
raise ValueError(f"Non-numeric value encountered: {e}")
if __name__ == "__main__":
if len(sys.argv) != 3:
print("Usage: python script.py <filename> <line_number>")
sys.exit(1)
filename = sys.argv[1]
try:
line_number = int(sys.argv[2])
except ValueError:
print("Line number must be an integer.")
sys.exit(1)
try:
total = sum_csv_line(filename, line_number)
print(f"Sum of line {line_number}: {total}")
except Exception as e:
print(f"Error: {e}")
sys.exit(1)
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