擅长:python、mysql、java
<p>在<code>Python 3</code>中类似的东西可能会起作用:</p>
<pre><code>import statistics
with open('10year-gdp.txt') as f:
items = []
for line in f.readlines():
line = line.strip()
if line.isdigit():
items.append(float(line))
else:
print('{0}: {1}'.format(line, statistics.mean(items)))
items = []
</code></pre>