Python排序列表中的第一个数字

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我想用第一个数字对这个字符串列表进行排序,最好是在一行中使用正则表达式,但欢迎其他建议.我正在努力获得最快捷的方式.这是清单;

[
  "10. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless I",
  "11. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless J",
  "12. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless K",
  "13. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless L",
  "14. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless M",
  "15. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless N",
  "16. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless O",
  "17. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless P",
  "18. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless Q",
  "19. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless R",
  "20. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless S",
  "21. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless z",
  "22. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless A",
  "5. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless D",
  "6. Command Mounting Refill Strips - Large Pack of 1 6 Strips E",
  "7. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless F",
  "8. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless G",
  "9. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless H"
]

这是我到目前为止尝试过的代码.

dirs = sorted(next(walk(self.rootDirectory))[1], key=lambda x: int(x[0]))

但这又回来了;

[
  "10. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless I",
  "11. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless J",
  "12. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless K",
  "13. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless L",
  "14. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless M",
  "15. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless N",
  "16. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless O",
  "17. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless P",
  "18. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless Q",
  "19. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless R",
  "20. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless S",
  "21. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless z",
  "22. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless A",
  "5. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless D",
  "6. Command Mounting Refill Strips - Large Pack of 1 6 Strips E",
  "7. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless F",
  "8. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless G",
  "9. iTOMA Radio Alarm Clock FM Digital Radio Clock Bedside Alarm Clock Wireless H"
]

更新

我是否也可以在不使用的情况下对其进行排序.字符.例如; “20 iTOMA收音机闹钟FM数字收音机时钟床头闹钟无线S”

解决方法:

拆分后转换为int.取全部数字,而不仅仅是第一个数字：

lst = next(walk(self.rootDirectory))[1]
dirs = sorted(lst, key=lambda x: int(x.split('.')[0]))

排序时’.’不一定在字符串中：

dirs = sorted(lst, key=lambda x: float(x.split()[0]))

可以使用或不使用’.’.

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