擅长:python、mysql、java
<p>你可以试试这样的。按设置创建名称,然后使用<a href="http://docs.python.org/2/library/sets.html#set-objects" rel="nofollow">set.difference</a>函数查找新的\已放弃的学生。你知道吗</p>
<pre><code>compass={student.strip() for student in open("compassfeb8.txt",'U')}
roster={student.strip() for student in open("feb4py.txt",'U')}
dropped_students = compass.difference(roster)
if not dropped_students:
print "Hooray! Nobody dropped."
roster1={student.strip() for student in open("jan24py.txt",'U')}
# roster2={student.strip() for student in open("feb4py.txt",'U')}
roster2 = roster
new_students = roster2.difference(roster1)
if not new_students:
print "There were no new students."
</code></pre>