async def model(moves, state, height, width):

while state['*'] not in {p for id_, p in state.items() if id_ != '*'}:

id_, d = await moves.get()

deltas = {D.n: P(0, -1), D.e: P(1, 0), D.s: P(0, 1), D.w: P(-1, 0)}

if 0 <= new_p.x < width-1 and 0 <= new_p.y < height:

state[id_] = new_p

<span class="hljs-keyword">async</span> <span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">model</span><span class="hljs-params">(moves, state, height, width)</span>:</span>

<span class="hljs-keyword">while</span> state[<span class="hljs-string">'*'</span>] <span class="hljs-keyword">not</span> <span class="hljs-keyword">in</span> {p <span class="hljs-keyword">for</span> id_, p <span class="hljs-keyword">in</span> state.items() <span class="hljs-keyword">if</span> id_ != <span class="hljs-string">'*'</span>}:

id_, d = <span class="hljs-keyword">await</span> moves.get()

deltas = {D.n: P(<span class="hljs-number">0</span>, <span class="hljs-number">-1</span>), D.e: P(<span class="hljs-number">1</span>, <span class="hljs-number">0</span>), D.s: P(<span class="hljs-number">0</span>, <span class="hljs-number">1</span>), D.w: P(<span class="hljs-number">-1</span>, <span class="hljs-number">0</span>)}

<span class="hljs-keyword">if</span> <span class="hljs-number">0</span> &lt;= new_p.x &lt; width<span class="hljs-number">-1</span> <span class="hljs-keyword">and</span> <span class="hljs-number">0</span> &lt;= new_p.y &lt; height:

state[id_] = new_p