使用数字对 python 字符串列表进行排序

Question

我有一个名为 filelist

的文件名列表

 In []: filelist
Out []: ['C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx',
         'C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx',
         'C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx']

我想根据粗体位置的数值文件列表排序

C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx
C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx
C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx

所以在这个例子中，输出将是

Out []: ['C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx',
         'C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx'
         'C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx']

谢谢！

Answer 1

找到一种好的、可靠的方法来提取您想要的号码。然后使用 key 参数按该数字排序。这对于您的输入来说似乎足够可靠，但效率不高。

a = ['C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx',
    'C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx',
    'C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx']

def k(a):
    x = a.split("\")[-1].split("-")[3]
    y = filter(lambda x: x in "0123456789", x)
    return int("".join(list(y)))


print(sorted(a, key=k))

输出：

['C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx', 
'C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx',
'C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx']

Answer 2

使用正则表达式解析数字并将其用作排序键。

快速而肮脏：

import re

l = ['C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx',
     'C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx',
     'C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx']

def get_sort_number(s):
    pattern = r'C:\Mon\d+\P-2NODE-RAID6-(\d+)'

    try:
        return int(re.match(pattern, s).group(1))
    except AttributeError:
        return 0

sorted(l, key=get_sort_number)

这给出了

['C:\Mon20412\P-2NODE-RAID6-1BLACK-32k-100-segmented.xlsx',
 'C:\Mon20362\P-2NODE-RAID6-2GREEN-32k-100-segmented.xlsx',
 'C:\Mon25312\P-2NODE-RAID6-13RED-32k-100-segmented.xlsx']

正则表达式无法匹配的所有字符串都将位于排序列表的开头。

Answer 3

import re

f = lambda s: int(re.findall(r'.*RAID6-(\d+).*', s)[0])
sorted(l, key=f)

使用数字对 python 字符串列表进行排序

Sort a python list of strings with a numeric number

python

sorting

string

numerical

list