根据位置排序字符串列表

Question

我有一个字符串列表，其模式如下

my_list = ['/path/to/my/data/S1B_IW_GRDH_1SDV_20190610T030906_20190610T030931_016628_01F4BE_6B99_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190523T030954_20190523T031019_027349_0315A8_999E_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190511T030953_20190511T031018_027174_03102E_402F_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190628T030956_20190628T031021_027874_032595_0B1F_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190604T030955_20190604T031020_027524_031B16_BD33_VV.tif',
     '/path/to/my/data/S1B_IW_GRDH_1SDV_20190622T030907_20190622T030932_016803_01F9F1_D6E9_VV.tif',
     '/path/to/my/data/S1B_IW_GRDH_1SDV_20190505T030904_20190505T030929_016103_01E4AD_17B5_VV.tif']

我想按照每个字符串中的时间信息（20190610,.....）按时间顺序对列表进行排序。问题在于，每个字符串开头都有模式S1A或S1B，这使得使用简单的mylist.sort()不能直接起作用。

通过查看其他帖子，我发现解决方案是使用key参数和某种模式。

我的问题是，如何从列表中每个字符串的特定位置开始排序。在我的情况下，我想从位置35开始排序，紧跟在_1SDV_之后。

我已经看到了一些选项，比如

from operator import itemgetter

my_list.sort(key = itemgetter(35)) 

或者

my_list.sort(key = lambda x: x[35])

- GCGM

---

你的意思是这个：20190610T030906？ - Dani Mesejo

@DanielMesejo 是的，但基本上我只对按日期排序感兴趣，你可以看到那里 - 20190610。 - GCGM

使用以下代码片段：my_list.sort(key=lambda x: x[35:]) - user2390182

@schwobaseggl，只有:将我与目标分开了，哈哈。如果您将其作为答案添加，我将很高兴接受它。 - GCGM

@schwobaseggl 也可以这样写：my_list.sort(key=itemgetter(slice(35, None)))。 - wjandrea

Answer 1

从评论中复制@schwobaseggl的解决方案，以下解决方案应该有效。

my_list.sort(key = lambda x: x[35:])

---

例子：

>>> my_list = ['91', '82', '73', '64', '55', '46', '37', '28', '19']
>>> my_list.sort()
>>> my_list
['19', '28', '37', '46', '55', '64', '73', '82', '91']
>>> my_list.sort(key = lambda x: x[1:]) # sorting after first position
>>> my_list
['91', '82', '73', '64', '55', '46', '37', '28', '19']

- Roofi

Answer 2

使用正则表达式：

import regex as re

my_list = ['/path/to/my/data/S1B_IW_GRDH_1SDV_20190610T030906_20190610T030931_016628_01F4BE_6B99_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190523T030954_20190523T031019_027349_0315A8_999E_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190511T030953_20190511T031018_027174_03102E_402F_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190628T030956_20190628T031021_027874_032595_0B1F_VV.tif',
     '/path/to/my/data/S1A_IW_GRDH_1SDV_20190604T030955_20190604T031020_027524_031B16_BD33_VV.tif',
     '/path/to/my/data/S1B_IW_GRDH_1SDV_20190622T030907_20190622T030932_016803_01F9F1_D6E9_VV.tif',
     '/path/to/my/data/S1B_IW_GRDH_1SDV_20190505T030904_20190505T030929_016103_01E4AD_17B5_VV.tif']

my_list.sort(key=lambda x: re.findall("\d{8}", x)[0])

print(my_list)

输出：

['/path/to/my/data/S1B_IW_GRDH_1SDV_20190505T030904_20190505T030929_016103_01E4AD_17B5_VV.tif',
 '/path/to/my/data/S1A_IW_GRDH_1SDV_20190511T030953_20190511T031018_027174_03102E_402F_VV.tif',
 '/path/to/my/data/S1A_IW_GRDH_1SDV_20190523T030954_20190523T031019_027349_0315A8_999E_VV.tif',
 '/path/to/my/data/S1A_IW_GRDH_1SDV_20190604T030955_20190604T031020_027524_031B16_BD33_VV.tif',
 '/path/to/my/data/S1B_IW_GRDH_1SDV_20190610T030906_20190610T030931_016628_01F4BE_6B99_VV.tif',
 '/path/to/my/data/S1B_IW_GRDH_1SDV_20190622T030907_20190622T030932_016803_01F9F1_D6E9_VV.tif',
 '/path/to/my/data/S1A_IW_GRDH_1SDV_20190628T030956_20190628T031021_027874_032595_0B1F_VV.tif']

- Clément