python utils file sequence checker

seqcheck.py

import os, re

#sequence checker, print gaps in a numberred img/files sequence in current working directory

l = [f for f in os.listdir(os.getcwd()) if not f.endswith('.py')]
miss = 0
gap = 0
i = 0
for f in l:
	num = re.search('^(.*?)(\d+)(\D*)$', l[i])
	num = int(num.group(2))
	if i:
		prev = re.search('^(.*?)(\d+)(\D*)$', l[i-1])
		prev = int(prev.group(2))
		res = num - prev
		if res > 1:
			gaplength = res - 1
			miss += gaplength
			gap += 1
			if res == 2:
				print ("gap {}".format(num - 1, gaplength))
			else:
				print ("gap {0} - {1} : {2} files".format(prev+1, num-1, gaplength))
	i += 1

if gap:
	print (gap, 'gap found')
	print (miss, "total missing")

print("finished :", i, "scanned")