CodeEval - One zero, two zeros... - Easy

import sys

def have_zeroes(num,val):
    val_bin = bin(val)[2:]
    counter = 0
    for c in val_bin:
        if c == '0':
            counter += 1
    return counter == num

def range_vals(num,val):
    counter = 0
    for i in range(1,val+1):
        if have_zeroes(num,i):
            counter += 1
    return counter

test_cases = open(sys.argv[1], 'r')
for test in test_cases:
   arr = map(int, test.split())
   print range_vals(arr[0],arr[1])

test_cases.close()