Node.js vs Python

test.js

var _ = require('lodash')

var length = 20000;

var arr = _.range(0, length);

console.time('add')
for (var i = 0; i < length; i++) {
	for (var j = 0; j < length; j++) {
		arr[j] += 1
	}
}
console.timeEnd('add')

test.py

import datetime

length = 20000

arr = range(length)


print datetime.datetime.now()
for i in xrange(length):
	for j in xrange(length):
		arr[j] += 1
print datetime.datetime.now()