问题描述
我想知道是否有类似PHP natsort Python 中的函数?
l = ['image1.jpg', 'image15.jpg', 'image12.jpg', 'image3.jpg']l.sort()
给出:
['image1.jpg', 'image12.jpg', 'image15.jpg', 'image3.jpg']
但我想得到:
['image1.jpg', 'image3.jpg', 'image12.jpg', 'image15.jpg']
更新
基于此链接
的解决方案def try_int(s):如果可能,转换为整数."尝试:返回整数除了:返回 sdef natsort_key(s):在内部用于获取 s 排序所依据的元组."进口重新return map(try_int, re.findall(r'(d+|D+)', s))def natcmp(a, b):自然字符串比较,区分大小写."返回 cmp(natsort_key(a), natsort_key(b))def natcasecmp(a, b):自然字符串比较,忽略大小写."返回 natcmp(a.lower(), b.lower())l.sort(natcasecmp);
导入重新def natural_key(string_):"""见 https://blog.codinghorror.com/sorting-for-humans-natural-sort-order/"""return [int(s) if s.isdigit() else s for s in re.split(r'(d+)', string_)]
示例:
>>>L = ['image1.jpg', 'image15.jpg', 'image12.jpg', 'image3.jpg']>>>排序(L)['image1.jpg', 'image12.jpg', 'image15.jpg', 'image3.jpg']>>>排序(L,键=natural_key)['image1.jpg', 'image3.jpg', 'image12.jpg', 'image15.jpg']为了支持 Unicode 字符串,应该使用 .isdecimal()
而不是 .isdigit()
.请参阅 @phihag 的评论.相关:如何显示 Unicodes 数值属性.
.isdigit()
也可能会失败(返回值不被 int()
接受)在 Python 2 上的某些语言环境中的字节串,例如 Windows 上 cp1252 语言环境中的'xb2' ('²').
I would like to know if there is something similar to PHP natsort function in Python?
l = ['image1.jpg', 'image15.jpg', 'image12.jpg', 'image3.jpg']
l.sort()
gives:
['image1.jpg', 'image12.jpg', 'image15.jpg', 'image3.jpg']
but I would like to get:
['image1.jpg', 'image3.jpg', 'image12.jpg', 'image15.jpg']
UPDATE
Solution base on this link
def try_int(s):
"Convert to integer if possible."
try: return int(s)
except: return s
def natsort_key(s):
"Used internally to get a tuple by which s is sorted."
import re
return map(try_int, re.findall(r'(d+|D+)', s))
def natcmp(a, b):
"Natural string comparison, case sensitive."
return cmp(natsort_key(a), natsort_key(b))
def natcasecmp(a, b):
"Natural string comparison, ignores case."
return natcmp(a.lower(), b.lower())
l.sort(natcasecmp);
From my answer to Natural Sorting algorithm:
import re
def natural_key(string_):
"""See https://blog.codinghorror.com/sorting-for-humans-natural-sort-order/"""
return [int(s) if s.isdigit() else s for s in re.split(r'(d+)', string_)]
Example:
>>> L = ['image1.jpg', 'image15.jpg', 'image12.jpg', 'image3.jpg']
>>> sorted(L)
['image1.jpg', 'image12.jpg', 'image15.jpg', 'image3.jpg']
>>> sorted(L, key=natural_key)
['image1.jpg', 'image3.jpg', 'image12.jpg', 'image15.jpg']
To support Unicode strings, .isdecimal()
should be used instead of .isdigit()
. See example in @phihag's comment. Related: How to reveal Unicodes numeric value property.
.isdigit()
may also fail (return value that is not accepted by int()
) for a bytestring on Python 2 in some locales e.g., 'xb2' ('²') in cp1252 locale on Windows.
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