本文通过一个具体的示例展示了如何使用Python的operator模块中的itemgetter函数来对学生名单按分数进行排序，并获取分数最高的前三名学生。
from operator import itemgetter
lst = [ {'student_name': 'zhangsan', 'student_score': 65},
{'student_name': 'lisi', 'student_score': 95},
{'student_name': 'wangwu', 'student_score': 80},
{'student_name': 'maliu', 'student_score': 75},
{'student_name': 'zhuqi', 'student_score': 88} ]
top3 = sorted(lst, key=itemgetter('student_score'), reverse=True)[:3]
print top3
lst = [ {'student_name': 'zhangsan', 'student_score': 65},
{'student_name': 'lisi', 'student_score': 95},
{'student_name': 'wangwu', 'student_score': 80},
{'student_name': 'maliu', 'student_score': 75},
{'student_name': 'zhuqi', 'student_score': 88} ]
top3 = sorted(lst, key=itemgetter('student_score'), reverse=True)[:3]
print top3
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