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如何对python中设置的字母数字集进行排序

分类: 技术问答 • 2022-06-01 22:55:58

问题描述：

我有一套

set(['booklet', '4 sheets', '48 sheets', '12 sheets'])

排序后，我希望它看起来像

After sorting I want it to look like

4 sheets,
12 sheets,
48 sheets,
booklet

请问

答

又甜又甜:

sorted(data, key=lambda item: (int(item.partition(' ')[0])
                               if item[0].isdigit() else float('inf'), item))

此版本:

可在Python 2和Python 3中使用，因为:
- 它不假定您比较字符串和整数(在Python 3中不起作用)
- 它不对sorted使用cmp参数(在Python 3中不存在)
- Works in Python 2 and Python 3, because:
  - It does not assume you compare strings and integers (which won't work in Python 3)
  - It doesn't use the cmp parameter to sorted (which doesn't exist in Python 3)
  如果您要完全按照示例中的说明打印输出，则:
  
  If you want printed output exactly as described in your example, then:
```
data = set(['booklet', '4 sheets', '48 sheets', '12 sheets'])
r = sorted(data, key=lambda item: (int(item.partition(' ')[0])
                                   if item[0].isdigit() else float('inf'), item))
print ',\n'.join(r)
```