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