如何使用 python 按字母顺序排列文件夹名称列表

Question

I'm trying to print the names of the folders in alphabetical order.

They obviously are when in the file directory but when I've separated parts of the folder names they won't print in alphabetical order.

This is the code:

import os, datetime
from tkinter import Tk
from tkinter.filedialog import askdirectory

SelectDrive = askdirectory(title='Select Folder') 
SubjectDetail = os.listdir(SelectDrive)

ListLen = (len(SubjectDetail))
SplitList = [i.split() for i in SubjectDetail]

i = 0

while i < ListLen:
    Name = SplitList[-i]
    NameLen =len(Name)

    DateOfBirth = (Name[NameLen-1])
    Name.remove(DateOfBirth)

    FullName = ' '.join(Name)

    print(FullName," ", DateOfBirth)

    i += 1

and the current output:

Arthur LEWIS 06111984
Sarah Rose WILLIAMS 23091974
Mark THOMAS 11062020
Lewis MCCARTNEY 15021994

and finally the output i'm looking for:

Arthur LEWIS 06111984
Lewis MCCARTNEY 15021994
Mark THOMAS 11062020
Sarah Rose WILLIAMS 23091974

Answer 1

There is the pathlib library for handling paths. So you could use something like

from pathlib import Path
from tkinter.filedialog import askdirectory

SelectDrive = askdirectory(title="Select Folder")
path = Path(SelectDrive)

list_of_dirs = sorted([i for i in path.iterdir() if i.is_dir()])

for d in list_of_dirs:
    print(d)

Answer 2

Name = SplitList[-i] is your problem. When you use a negative index, Python starts counting from the end of the list starting at 1. So if you had a list, a = [1, 2, 3, 4, 5] , if you do a[-2] it will count 5 as index -1 then 4 as index -2 and will return that to you. That's why it returns the first file name because -0 is interpreted as index 0, but index -1 means the last element of the list, index -2 would be the second-last element and so on.

I wrote up some code, it outputs the same thing you requested but I'm not sure it suits your needs:

import os
from tkinter.filedialog import askdirectory

SelectDrive = askdirectory(title='Select Folder') 
SubjectDetail = os.listdir(SelectDrive)

SplitList = [i.split() for i in SubjectDetail]

for person in SplitList:
    print(*person)

If you want to keep your code somewhat the same, you should be able to just use index i but without adding the negative sign and that should solve your problem: Name = SplitList[i] .

Cheers.

Answer 3

I have change my while loop so it's now looking to see if list length is greater than i. This allows the output to be in order.

while ListLen > i:
    Name = SplitList[+i]
    NameLen =len(Name)
    NameSort = []
    DateOfBirth = (Name[NameLen-1])

    Name.remove(DateOfBirth)

    FullName = ' '.join(Name)

    print(FullName, " ",DateOfBirth)

    i += 1