以下代码将解决您的问题。您必须遍历列表的副本。您无法从要迭代的列表中删除项目。
import copy
def main():
titles_list = ["English", "Math", "History", "IT", "Biology", "Spanish"]
titles_list_orig = copy.deepcopy(titles_list)
for title in titles_list_orig:
print "Do you want to keep the title:", title , "\n or Delete it? Input Y for keep, N for Delete "
Question = raw_input()
if str(Question.upper()) == "N":
titles_list.remove(title)
print titles_list
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