擅长:python、mysql、java
<p>直截了当地(仅针对2层嵌套):</p>
<pre><code>x = {'NIFTY': {11382018: 'NIFTY19SEPFUT', 13177346: 'NIFTY19OCTFUT', 12335874: 'NIFTY19NOVFUT'}}
search_key = 11382018
parent_key, value = None, None
for k, inner_d in x.items():
if search_key in inner_d:
parent_key, value = k, inner_d[search_key]
break
print(parent_key, value) # NIFTY NIFTY19SEPFUT
</code></pre>