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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def posted_data_dict(self):
 """ All the data that PayPal posted to us, as a correctly parsed dictionary of values. """

        if not self.query:
            return None
        from django.http import QueryDict
        roughdecode = dict(item.split('=', 1) for item in self.query.split('&'))
        encoding = roughdecode.get('charset', None)
        if encoding is None:
            encoding = DEFAULT_ENCODING
        query = self.query.encode('ascii')
        data = QueryDict(query, encoding=encoding)
        return data.dict()