擅长:python、mysql、java
<p>您只需将<code>print</code>行拉到while循环之外。像这样-</p>
<pre><code>def num_doublings(initial_population, final_population):
time = 1
while initial_population < final_population:
time+= 1
initial_population = initial_population * 2
print(time)
</code></pre>
<p>注意,我初始化了<code>time =1</code></p>