擅长:python、mysql、java
<p>你可以试试这个:</p>
<pre><code>def num_doublings(initial_population, final_population):
time = 0
while initial_population <= final_population:
time+= 1
initial_population = initial_population * 2
return time
</code></pre>
<p>函数将返回时间变量,在您给出的示例中为3</p>