[Python3] straight forward solution
slipt the email into local and domain\n  clean local\n\t \treplace \',\' with \'\' in local\n\t \tslice local from the beginning of local to the index of \'+\'\
* slipt the email into local and domain\n*  clean local\n\t* \treplace \',\' with \'\' in local\n\t* \tslice local from the beginning of local to the index of \'+\'\n*  rebuild the email address using cleaned local and domain \n*  count the rebuild email address\n\n```\nclass Solution:\n    def numUniqueEmails(self, emails: List[str]) -> int:\n        seen = set()\n        for i in emails:\n            local,domain = i.split(\'@\')\n            if \'.\' in local:\n                local = local.replace(\'.\',\'\')\n            if \'+\' in local:\n                local = local[:local.index(\'+\')]\n            seen.add(local+\'@\'+domain)\n        return len(seen)\n```
['Python', 'Python3']