Submission: Python 3

[the-fanan]

• Hardware

Processor Name: Intel® Core™ i5-2540M CPU @ 2.60GHz × 4 
Memory: 8 GB

• Time ~= 7s

• Memory ~= 82000 kilobytes

• Program

class FileNumberSummer:
	def __init__(self, rootDir, start, end):
		self.rootDir = rootDir
		self.start = start
		self.end = end

	def generateFolderName(self,value):
		if value % 10 == 0:
			value = value - 1
		highest = value + (10 - (value % 10))
		lowest = highest - 9
		return "{0:0=6}".format(lowest) + "-" + "{0:0=6}".format(highest)

	def generateFileName(self,value):
		return "{0:0=6}".format(value) + ".csv"

	def sumNumbersInFile(self,fileDir):
		fileContent = open(fileDir, "r")
		sums = 0
		try:
			line = fileContent.readline()
			while line:
				sums += sum(map(int,line.split(',')))
				line = fileContent.readline()
		finally:
			fileContent.close()
		return sums

	def getSum(self):
		sums = 0
		for i in range(self.start, self.end + 1):
			sums += self.sumNumbersInFile(self.rootDir + "/" + self.generateFolderName(i) + "/" + self.generateFileName(i))
		return sums

import os
from FileNumberSummer import FileNumberSummer
# 1, 1000 because the files are named from 000001.csv to 001000.csv
FNS = FileNumberSummer(os.getcwd() + "/files", 1, 1000)
print(FNS.getSum())

solution hosted on: https://github.com/the-fanan/sum-files-challenge

• Command
  pypy python-solution/main.py
• Output
  49947871404