1import sys 2 3found = 0 4prevnum = -1 5fd = open(sys.argv[1]) 6for a in fd.readlines(): 7 f = a[0:a.find(':')] 8 num = int(a[a.find(':')+1:-2]) 9 if num == prevnum+1: found += 1 10 if found == 2: 11 print('Found double blank line '+str(num)+' '+f) 12 found = 0 13 prevnum = num 14