# Buggy code
def take_step(self):
    """
    We are asked to update, see if we have enough peers to start culling them.
    If we do have enough peers, select a suitable peer to remove.

    :returns: None
    """
    with self.walk_lock:
        peers = self.overlay.get_peers()
        for peer in list(self.intro_sent.keys()):
            if peer not in peers:
                self.intro_sent.pop(peer, None)

        # Some of the peers in the community could have been discovered using the DiscoveryCommunity. If this
        # happens we have no knowledge of their peer_flags. In order to still get the flags we send them an
        # introduction request manually.
        now = time.time()
        for peer in peers:
            if (
                peer not in self.overlay.candidates
                and now > self.intro_sent.get(peer, 0) + 300
            ):
                self.overlay.send_introduction_request(peer)
                self.intro_sent[peer] = now

        peer_count = len(peers)
        if peer_count > self.target_peers:
            exit_peers = set(self.overlay.get_candidates(PEER_FLAG_EXIT_ANY))
            exit_count = len(exit_peers)
            ratio = 1.0 - exit_count / peer_count  # Peer count is > 0 per definition
            if ratio < self.golden_ratio:
                self.overlay.network.remove_peer(sample(exit_peers, 1)[0])
            elif ratio > self.golden_ratio:
                self.overlay.network.remove_peer(
                    sample(set(self.overlay.get_peers()) - exit_peers, 1)[0]
                )


# Traceback (RuntimeError)
Traceback (most recent call last):
File "src\tribler-gui\tribler_gui\event_request_manager.py", line 116, in on_read_data
RuntimeError:
--LONG TEXT--
Traceback (most recent call last):
File "lib\asyncio\events.py", line 81, in _run
File "ipv8\messaging\anonymization\tunnel.py", line 149, in on_ip_address
asyncio.exceptions.CancelledError

--CONTEXT--
{'message': 'Exception in callback TunnelExitSocket.sendto.<locals>.on_ip_address(<Task cancell...unnel.py:171>>) at ipv8\\messaging\\anonymization\\tunnel.py:147', 'exception': CancelledError(), 'handle': <Handle TunnelExitSocket.sendto.<locals>.on_ip_address(<Task cancell...unnel.py:171>>) at ipv8\messaging\anonymization\tunnel.py:147>}

# Fixed code
def take_step(self):
    """
    We are asked to update, see if we have enough peers to start culling them.
    If we do have enough peers, select a suitable peer to remove.

    :returns: None
    """
    with self.walk_lock:
        peers = self.overlay.get_peers()
        for peer in list(self.intro_sent.keys()):
            if peer not in peers:
                self.intro_sent.pop(peer, None)

        # Some of the peers in the community could have been discovered using the DiscoveryCommunity. If this
        # happens we have no knowledge of their peer_flags. In order to still get the flags we send them an
        # introduction request manually.
        now = time.time()
        for peer in peers:
            if (
                peer not in self.overlay.candidates
                and now > self.intro_sent.get(peer, 0) + 300
            ):
                self.overlay.send_introduction_request(peer)
                self.intro_sent[peer] = now

        peer_count = len(peers)
        if peer_count > self.target_peers:
            exit_peers = set(self.overlay.get_candidates(PEER_FLAG_EXIT_BT))
            exit_count = len(exit_peers)
            ratio = 1.0 - exit_count / peer_count  # Peer count is > 0 per definition
            if ratio < self.golden_ratio:
                self.overlay.network.remove_peer(sample(exit_peers, 1)[0])
            elif ratio > self.golden_ratio:
                self.overlay.network.remove_peer(
                    sample(set(self.overlay.get_peers()) - exit_peers, 1)[0]
                )