擅长:python、mysql、java
<p>最佳做法是创建要删除的条目的新列表,并在遍历列表后将其删除:</p>
<pre><code>to_del = []
subjectlength = 8
for x in range(subjectlength):
for y in range(x):
if subject[x] == subject[y]:
#add
time[x] = time[x] + time[y]
to_del.append(y)
to_del.reverse()
for d in to_del:
del subject[d]
del time[d]
</code></pre>