26 lines
833 B
Python
26 lines
833 B
Python
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# 我们有一个字典列表，想要按照字典里的某些键对列表进行排序
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# 字典列表如下：
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rows = [
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{"fname":"Brian", "lname": "Jones", "uid":1003},
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{"fname":"David", "lname": "Beazley", "uid":1002},
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{"fname":"John", "lname": "Cleese", "uid":1001},
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{"fname":"Big", "lname": "Jones", "uid":1004}
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]
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# 这时候用到itemgetter模块
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from operator import itemgetter
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# itemgetter的主要功能是通过可查询的标记进行数据获取;
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# 下面分别根据fname和uid进行数据获取
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rows_by_fname = sorted(rows, key=itemgetter("fname"))
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rows_by_uid = sorted(rows, key=itemgetter("uid"))
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print(rows_by_fname)
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print(rows_by_uid)
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# 当然，itemgetter也能被lambda函数替代，替代操作如下：
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rows_by_fname_v2 = sorted(rows, key= lambda row: row["fname"])
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print(rows_by_fname_v2)
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