'Adds a infohash into this session.
:param infohash: The infohash to be added.'

def add_infohash(self, infohash):

    assert (not self._is_initiated), u'Must    not    add    request    to    an    initiated    session.'
    assert (not self.has_infohash(infohash)), u'Must    not    add    duplicate    requests'
    self._infohash_list.append(infohash)
