你如何按数字对文件进行排序? [英] How do you sort files numerically?

问题描述

我正在处理目录中的一些文件，需要按数字对文件进行排序.我在 找到了一些关于排序的示例——特别是使用 lambda 模式wiki.python.org，我把它放在一起:

I'm processing some files in a directory and need the files to be sorted numerically. I found some examples on sorting—specifically with using the lambda pattern—at wiki.python.org, and I put this together:

import re

file_names = """ayurveda_1.tif
ayurveda_11.tif
ayurveda_13.tif
ayurveda_2.tif
ayurveda_20.tif
ayurveda_22.tif""".split('
')

num_re = re.compile('_(d{1,2}).')

file_names.sort(
    key=lambda fname: int(num_re.search(fname).group(1))
)

有没有更好的方法来做到这一点?

Is there a better way to do this?

推荐答案

这称为自然排序"或人工排序"(与字典排序相反，这是默认的排序).Ned B 写了一个快速版本.

This is called "natural sorting" or "human sorting" (as opposed to lexicographical sorting, which is the default). Ned B wrote up a quick version of one.

import re

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

def alphanum_key(s):
    """ Turn a string into a list of string and number chunks.
        "z23a" -> ["z", 23, "a"]
    """
    return [ tryint(c) for c in re.split('([0-9]+)', s) ]

def sort_nicely(l):
    """ Sort the given list in the way that humans expect.
    """
    l.sort(key=alphanum_key)

这与您正在做的类似，但可能更笼统一些.

It's similar to what you're doing, but perhaps a bit more generalized.

这篇关于你如何按数字对文件进行排序?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！