将`1 `替换为`1`

Question

假设有这样一个列表

l = ['1\xa0My Cll to Adventure: 1949–1967',
 '2\xa0Crossing the Threshold: 1967–1979',
 '3\xa0My Abyss: 1979–1982',
 '4\xa0My Rod of Trils: 1983–1994',
 '5\xa0The Ultimte Boon: 1995–21',
 '6\xa0Returning the Boon: 211–215',
 '7\xa0My Lst Yer nd My Gretest Chllenge: 216–217',
 '8\xa0Looking Bck from  Higher Level']

我想要的结果是

[' 1.My Cll to Adventure: 1949–1967',
 ' 2.Crossing the Threshold: 1967–1979',
 ' 3.My Abyss: 1979–1982',
 ' 4.My Rod of Trils: 1983–1994',
 ' 5.The Ultimte Boon: 1995–21',
 ' 6.Returning the Boon: 211–215',
 ' 7.My Lst Yer nd My Gretest Chllenge: 216–217',
 ' 8.Looking Bck from  Higher Level']

我试着用代码

import re
In [114]: [re.sub(r'\d\xa0', r' \d.', i) for i in l]
Out[114]:
[' \\d.My Cll to Adventure: 1949–1967',
 ' \\d.Crossing the Threshold: 1967–1979',
 ' \\d.My Abyss: 1979–1982',
 ' \\d.My Rod of Trils: 1983–1994',
 ' \\d.The Ultimte Boon: 1995–21',
 ' \\d.Returning the Boon: 211–215',
 ' \\d.My Lst Yer nd My Gretest Chllenge: 216–217',
 ' \\d.Looking Bck from  Higher Level']

它不能像我想要的那样用数字代替。

如何完成这样的任务？

Answer 1

在句号之前，你没有捕捉到你想要的数字。为此，我们只需要在要捕获的数字周围使用括号，然后使用它们的捕获组id引用它们，即1。

通过以下方式：

l = ['1\xa0My Cll to Adventure: 1949–1967',
 '2\xa0Crossing the Threshold: 1967–1979',
 '3\xa0My Abyss: 1979–1982',
 '4\xa0My Rod of Trils: 1983–1994',
 '5\xa0The Ultimte Boon: 1995–21',
 '6\xa0Returning the Boon: 211–215',
 '7\xa0My Lst Yer nd My Gretest Chllenge: 216–217',
 '8\xa0Looking Bck from  Higher Level']

然后我们运行：

import re
[re.sub(r'(\d+)\xa0', r' \1.', i) for i in l]

并获得输出：

[' 1.My Cll to Adventure: 1949–1967',
 ' 2.Crossing the Threshold: 1967–1979',
 ' 3.My Abyss: 1979–1982',
 ' 4.My Rod of Trils: 1983–1994',
 ' 5.The Ultimte Boon: 1995–21',
 ' 6.Returning the Boon: 211–215',
 ' 7.My Lst Yer nd My Gretest Chllenge: 216–217',
 ' 8.Looking Bck from  Higher Level']

Answer 2

以下是在for循环中使用string replace方法的工作原理：

outl = []
for i in l:
    outl.append(" "+i.replace("\xa0",".",1))
print(outl)

输出：

[' 1.My Cll to Adventure: 1949–1967', 
' 2.Crossing the Threshold: 1967–1979', 
' 3.My Abyss: 1979–1982', 
' 4.My Rod of Trils: 1983–1994', 
' 5.The Ultimte Boon: 1995–21', 
' 6.Returning the Boon: 211–215', 
' 7.My Lst Yer nd My Gretest Chllenge: 216–217', 
' 8.Looking Bck from  Higher Level']