checks acelometer measurements and says if device is in free-fall

free-fall

from datetime import datetime
from math import sqrt
import csv

f = open("train.csv", "rb")

r = csv.reader(f)
header = r.next()

print(header)

loop = 0

for l in r:
    try:
        if l[1] == '0' and l[2] == '0' and l[3] == '0':
            # ignore
            continue
        x = float(l[1])
        y = float(l[2])
        z = float(l[3])
    except ValueError:
        print("error in converting line: ", l)

    v = sqrt(x**2 + y**2 + z**2)

    if v <= 0.05:
        print("Device is in free-fall", l)

    loop += 1

f.close()