Python no-import fuzzy finder

fuzzyfinder.py

def fuzzyfinder(pattern, collection):
    results = []

    for item in collection:
        key = []

        # Start the find at the beginning of the string
        index = -1
        for x in pattern:
            # Find the next letter in the pattern after the prevous match
            index = item.find(x, index + 1)
            if index == -1:
                # Not Found. Skips the else for this iteration
                break
            key.append(index)
        else:
            # If all are found
            results.append((key, item))

    return (y for _, y in sorted(results))


collection = ['django_migrations.py',
            'django_admin_log.py',
            'main_generator.py',
            'migrations.py',
            'api_user.doc',
            'user_group.doc',
            'accounts.txt',
            ]

print list(fuzzyfinder('migg', collection))