擅长:python、mysql、java
<p>只要检查一下这个项目是否已经在字典的键中。仅当尚未插入时插入。你知道吗</p>
<pre><code>def add_new_unit(d, name, value):
if(name in d.keys()):
print("The reactor information for {name} already recorded!".format(name = name))
return d
d[name] = Unit(name, value)
return d
</code></pre>