Find the last file name in python

Question

I have same file name eg: filename1, filename2 , filename3, filename4 ..... filename10

I want to find last file of that specific name over here last file name is filename10

import os
import datetime
import re

files = []
for file in os.listdir("C:\\Users\\Mayur Pawar\\Desktop\\FTP work"):
    if file.endswith(".csv"):
        files.append(file)
#s = sorted(files)

#print(files)

sorted(files)

Do you want to sort them alphabetically and then display the last one? — Capie, Feb 17 '20 at 11:47
Sorting alphabetically will give you for example, `filename1`, `filename10`, `filename2`... You need to sort according to the number **as a number**, not as string — Tomerikoo, Feb 17 '20 at 11:50
Does this answer your question? [Getting the last element of a list](https://stackoverflow.com/questions/930397/getting-the-last-element-of-a-list) — MSpiller, Feb 17 '20 at 11:54
One problem is that "sorted" returns a new list. You can try "files.sort()" instead. — Michael Butscher, Feb 17 '20 at 11:55

score 5 · Answer 1 · answered Feb 17 '20 at 11:51

5

you can use the built-in function max:

import re

last_file = max(files, key=lambda x: int(re.search(r'\d+', x).group()))

answered Feb 17 '20 at 11:51

kederrac

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example: list = [abc1,abc2,abc3,abc4,efg1,efg2,efg3,efg4,efg5] – Mayur Pawar Feb 18 '20 at 04:58
in above list i want to find the last filename. in abc last file is abc4 and efg5 – Mayur Pawar Feb 18 '20 at 05:00
Seems like you want the last 2 or? – kederrac Feb 18 '20 at 06:52

score 0 · Answer 2 · answered Feb 17 '20 at 12:04

You can use a Regex to do this. Not the most beautiful code ever, but it works. However, if filename has other number, you may need a more complex regex:

import re

files = ["filename10", "filename2", "fileename3"]

highest = 0
filename = ""
for f in files:
    dd = re.search(r'\d+', f)
    filenumber = int(dd.group())
    if filenumber > highest:
        highest = filenumber
        filename = f

Find the last file name in python

2 Answers2