擅长:python、mysql、java
<p>您可以使用<code>defaultdict</code></p>
<pre><code>from collections import defaultdict
d = defaultdict(dict)
for _,x in df.iterrows():
d[x['User']][x['ASIN']] = x['Rating']
d=dict(d)
d['A23VKINWRY6J92']['1476783284']
Out[108]: 5
</code></pre>