擅长:python、mysql、java
<p>这应该起作用:</p>
<pre><code>with open(datafile, "r") as file:
data = file.readlines()
web_count = 0
for line in data[::2]:
if line.startswith("web"):
web_count += 1
print(f"{web_count} websites found.")
</code></pre>
<p>只通过第0、2、4行。。。(数据[::2])</p>