null created by anonymous - https://repl.it/X3G/4601

X3G-4601.py

#/usr/bin/env python
import re
import json

def slugify(title):
    title = title.lower()
    empties = re.compile('[-\\s]+')
    title = empties.sub('-', title)
    odds = re.compile('[^\w\s-]')
    title = odds.sub('', title)
    return title

v = [
	{'title': 'Apartment, The'}, 
	{'title': 'Bar'}, 
	{'title': 'Apartment, The'},
	{'title': 'Foo'},
	{'title': 'Foo'},
	{'title': 'The Foo is Strong'},
	{'title': 'Foo Bar'},
	{'title': 'Foo: 3'}
]

ov = []

for item in v:
	# make a base slug of the title
	slug = slugify(item['title'])
	
	# create regex with base slug
	reg = ur"^" + slug + "(-[0-9][^a-z]*)?$"
	
	print reg
	
	# find all items already loaded that have same slug with or without "-n"
	matches = [a for a in ov if re.match(reg, slugify(a['title']), re.MULTILINE)]
	
	if len(matches) > 0:
		# if we have some matching slugs add "-n" with the next index
		item['slug'] = "%s-%i" % (slug, len(matches))
	else:
		# if no matches then just use the base slug
		item['slug'] = slug
		
	ov.append(item)
	
print json.dumps(ov, indent=4)