擅长:python、mysql、java
<p>要获得所有组合,可以使用<code>itertools.product</code>。然后可以将结果存储在字典中:</p>
<pre><code>result = {}
for r, p in itertools.product(regions, positions):
result[(r,p)] = len( [None for item in item_dict.values() if item['Region'] == r and item['Matrix Position'] == p] )
print(result[("AMER", "Calculate")])
</code></pre>