Sort a python list of strings with a numeric number

Question

I have a list of filenames called filelist

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


        

Answer 1

Find a good, reliable way to extract the number that you want. Then sort by that number, using the key argument. This seems to be reliable enough for your input, but it's not efficient.

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))

output:

['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']