擅长:python、mysql、java
<p>不管您试图解释为什么要这样做,下面是您实际如何设置该条件(使用一个较小的示例):</p>
<pre><code>etheurticker = {
'askVolume': 1,
'bidVolume': 2,
'vwap': 3
}
if all(x in etheurticker for x in ['askVolume', 'bidVolume', 'vwap']):
print("they are all there")
del etheurticker['vwap']
print(etheurticker)
else:
print("not all there")
# they are all there
# {'askVolume': 1, 'bidVolume': 2}
</code></pre>
<p>请注意,<code>vwap</code>设置为<code>None</code>并不重要</p>