各位大神，用python对数据库中的某列数据排序怎么搞？？？不是用sql来排序哦 python数据列名为日期,怎么指定某列排序？
\u5982\u4f55\u4f7f\u7528python\u7ed9\u4e00\u4e2asql\u811a\u672c\u6587\u4ef6\u6309id\u53f7\u6392\u5e8f\uff1f\u82e5SQL\u811a\u672c\u4e0d\u592a\u5927\uff0c\u4e14\u6392\u5e8f\u5b57\u6bb5\u4e3avalues\u4e2d\u7684\u7b2c\u4e00\u4e2a\u503c\uff1a
>>> content = '''
... INSERT INTO `dx_forum_thread` VALUES (9422, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
... INSERT INTO `dx_forum_thread` VALUES (945, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
... INSERT INTO `dx_forum_thread` VALUES (8422, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
... INSERT INTO `dx_forum_thread` VALUES (84221, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
... INSERT INTO `dx_forum_thread` VALUES (85, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
... INSERT INTO `dx_forum_thread` VALUES (9, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
... '''
>>> import re
>>> patt = re.compile(r'.*\((\d+),.*', re.I|re.X|re.U)
>>> lns = [(int(patt.match(ln).group(1)), ln) for ln in filter(patt.match, content.splitlines())]
>>> print '\n'.join([ln for (id, ln) in sorted(lns)])
INSERT INTO `dx_forum_thread` VALUES (9, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
INSERT INTO `dx_forum_thread` VALUES (85, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
INSERT INTO `dx_forum_thread` VALUES (945, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
INSERT INTO `dx_forum_thread` VALUES (8422, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
INSERT INTO `dx_forum_thread` VALUES (9422, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
INSERT INTO `dx_forum_thread` VALUES (84221, 13, 0, 0, 0, 0, \uff0e\uff0e\uff0e\uff0e, 0);
>>>
excel\u597d\u529e\uff0c\u6570\u636e\u5e93\u7684\u8bdd\uff0c\u4e00\u4e2a\u65e5\u671f\u4e00\u4e2a\u5b57\u6bb5\uff1f
通过例子来说明sorted的用法：
1. 对由tuple组成的List排序
Python代码
>>> students = [('john', 'A', 15), ('jane', 'B', 12), ('dave', 'B', 10),]
用key函数排序(lambda的用法见 注释1)
Python代码
>>> sorted(students, key=lambda student : student[2]) # sort by age
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]
用cmp函数排序
Python代码
>>> sorted(students, cmp=lambda x,y : cmp(x[2], y[2])) # sort by age
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]
用 operator 函数来加快速度, 上面排序等价于:(itemgetter的用法见 注释2)
Python代码
>>> from operator import itemgetter, attrgetter
>>> sorted(students, key=itemgetter(2))
用 operator 函数进行多级排序
Python代码
>>> sorted(students, key=itemgetter(1,2)) # sort by grade then by age
[('john', 'A', 15), ('dave', 'B', 10), ('jane', 'B', 12)]
2. 对由字典排序
Python代码
>>> d = {'data1':3, 'data2':1, 'data3':2, 'data4':4}
>>> sorted(d.iteritems(), key=itemgetter(1), reverse=True)
[('data4', 4), ('data1', 3), ('data3', 2), ('data2', 1)]
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