# -*- coding: utf-8 -*-
import re

class Counter(object):
    def __init__(self, find, replace):
        self.i = 0
        self.find = find
        self.replace = replace

    def sub(self, sentence):
        self.i = 0
        return re.sub('(%s)' % self.find, self, sentence)
    def __call__(self, g):
        self.i += 1
        return self.replace

c = Counter('toto', 'tata')

print c.sub('Salut toto. ça va toto')
print c.i