Question

大家好。我最近在学习python。

我在按数字顺序排序文件时遇到问题。我在列表中按顺序排列文件：

["1card.txt", "card.txt" , "3card.txt", "52card.txt", "badcard.txt"]

当我只打印列表时，它不按顺序打印，而是打印：1card.txt, 10card.txt等等。那我该如何修复以下代码呢？

file=glob.glob('/directory/*.txt')
sorted(file, key=int)

Answer 1

怎么样：

import re

def tryint(s):
    try:
        return int(s)
    except ValueError:
        return s

def alphanum_key(s):
    return [tryint(c) for c in re.split('([0-9]+)', s)]

def sort_nicely(l):
    return sorted(l, key=alphanum_key)

然后你可以这样做：

>>> file = ["1card.txt", "card.txt" , "3card.txt", "52card.txt", "badcard.txt"]
>>> sort_nicely(file)
['1card.txt', '3card.txt', '52card.txt', 'badcard.txt', 'card.txt']

Answer 2

没有正则表达式的简单解决方案可能是：

def sort_int(examp):
    pos = 1
    while examp[:pos].isdigit():
        pos += 1
    return examp[:pos-1] if pos > 1 else examp

sorted(files, key=sort_int)

['1card.txt'，'3card.txt'，'52card.txt'，'badcard.txt'，'card.txt']

Answer 3

files = ["1card.txt", "card.txt" , "3card.txt", "52card.txt", "badcard.txt"]

def nat_sort(s):
    '''
    provides a sort mechanism for strings that may or 
    may not lead with an integer
    '''
    for i, c in enumerate(s):
        if not c.isdigit():
            break
    if not i:
        return 0, s
    else:
        return int(s[:i]), s[i:]

files.sort(key=nat_sort)

现在files是一个排序列表：

['badcard.txt', 'card.txt', '1card.txt', '3card.txt', '52card.txt']

要对相似的字母进行排序，请按照与上述类似的方式进行：

def nat_sort(s):
    '''
    provides a sort mechanism for strings that may or 
    may not lead with an integer, but groups by strings 
    starting after integers, if any
    '''
    for i, c in enumerate(s):
        if not c.isdigit():
            break
    if not i:
        return s, 0
    else:
        return  s[i:], int(s[:i])

files.sort(key=nat_sort)

现在文件返回：

['badcard.txt', 'card.txt', '1card.txt', '3card.txt', '52card.txt']

Answer 4

您可以通过调用列表的 sort（）方法来整理列表：

>>> foo= ['spam', 'eggs', 'ggg']
>>> foo.sort()
['eggs', 'ggg', 'spam']

在python中按数字顺序排序文件名

4 个答案: