Python：list.sort（）似乎不起作用

Question

>>> x = set(['216', '217', '214', '215', '212', '213', '210', '211', '165', '264', '218', '219', '133', '132', '131', '130', '137', '136', '135', '226', '139', '138', '166', '24', '25', '26', '27', '20', '21', '22', '23', '95', '28', '29', '222', '288', '346', '4', '161', '8', '163', '348', '119', '868', '258', '120', '121', '122', '260', '124', '125', '126', '127', '128', '129', '167', '118', '59', '58', '55', '54', '57', '56', '51', '50', '53', '52', '298', '292', '293', '164', '201', '199', '179', '200', '195', '194', '706', '134', '191', '190', '193', '192', '115', '114', '88', '89', '111', '110', '113', '176', '82', '83', '80', '81', '86', '87', '84', '85', '117', '198', '3', '177', '171', '7', '247', '309', '225', '306', '307', '178', '244', '108', '109', '241', '240', '102', '103', '100', '101', '106', '107', '104', '105', '39', '38', '33', '32', '31', '30', '37', '36', '35', '34', '642', '181', '393', '205', '223', '207', '60', '61', '62', '63', '64', '65', '66', '67', '68', '69', '175', '174', '173', '172', '254', '170', '203', '249', '248', '182', '183', '180', '2', '162', '187', '184', '6', '220', '188', '189', '197', '202', '313', '196', '221', '185', '99', '98', '168', '169', '229', '228', '91', '90', '93', '92', '160', '94', '97', '96', '11', '10', '13', '12', '15', '14', '17', '16', '19', '18', '272', '250', '116', '204', '151', '150', '153', '152', '155', '154', '157', '156', '159', '158', '112', '279', '234', '235', '236', '237', '231', '232', '224', '48', '49', '46', '47', '44', '45', '42', '43', '40', '41', '1', '320', '5', '9', '146', '147', '144', '145', '142', '143', '140', '141', '208', '394', '148', '149', '77', '76', '75', '74', '73', '72', '71', '70', '79', '78', '263', '262', '472', '123', '276'])
>>> type(x)

    <type 'set'>

Now I create a list

>>> y = list(x)
>>> type(y)
<type 'list'>

Now I sort

>>> y.sort()

>>> y

['1', '10', '100', '101', '102', '103', '104', '105', '106', '107', '108', '109', '11', '110', '111', '112', '113', '114', '115', '116', '117', '118', '119', '12', '120', '121', '122', '123', '124', '125', '126', '127', '128', '129', '13', '130', '131', '132', '133', '134', '135', '136', '137', '138', '139', '14', '140', '141', '142', '143', '144', '145', '146', '147', '148', '149', '15', '150', '151', '152', '153', '154', '155', '156', '157', '158', '159', '16', '160', '161', '162', '163', '164', '165', '166', '167', '168', '169', '17', '170', '171', '172', '173', '174', '175', '176', '177', '178', '179', '18', '180', '181', '182', '183', '184', '185', '187', '188', '189', '19', '190', '191', '192', '193', '194', '195', '196', '197', '198', '199', '2', '20', '200', '201', '202', '203', '204', '205', '207', '208', '21', '210', '211', '212', '213', '214', '215', '216', '217', '218', '219', '22', '220', '221', '222', '223', '224', '225', '226', '228', '229', '23', '231', '232', '234', '235', '236', '237', '24', '240', '241', '244', '247', '248', '249', '25', '250', '254', '258', '26', '260', '262', '263', '264', '27', '272', '276', '279', '28', '288', '29', '292', '293', '298', '3', '30', '306', '307', '309', '31', '313', '32', '320', '33', '34', '346', '348', '35', '36', '37', '38', '39', '393', '394', '4', '40', '41', '42', '43', '44', '45', '46', '47', '472', '48', '49', '5', '50', '51', '52', '53', '54', '55', '56', '57', '58', '59', '6', '60', '61', '62', '63', '64', '642', '65', '66', '67', '68', '69', '7', '70', '706', '71', '72', '73', '74', '75', '76', '77', '78', '79', '8', '80', '81', '82', '83', '84', '85', '86', '868', '87', '88', '89', '9', '90', '91', '92', '93', '94', '95', '96', '97', '98', '99']

But check elements in y, they doesn't seem to be sorted. Whats wrong here?

Answer 1

如果要按int的形式对它们进行排序，即按数字而不是按字典顺序y = sorted(x, key=int) ，请使用y = sorted(x, key=int) 。

Answer 2

Because these are strings you are sorting eg '1','2' and '100', they are ordered by the bytes that make up the string.. not the number the string represents.

Because the bytes that represent the character '1' is less that the byte that represents the character '2', all the strings starting with '1' will be first. etc etc.

You need do convert the strings to integers and then sort them to make them sort in numerical order.

G./