Python 2.7 如何提取文件中文本中间的块 如何提取文本中间的一个块。

例如：

User authority


--------------


              Subscriber number  =  189159


             Call-out authority  =  Intra-office


                                 =  Local


                                 =  Local toll


                                 =  National toll


                                 =  International toll


                                 =  Intra-Centrex


                                 =  Outgoing Centrex


                                 =  Intra-office national toll


                                 =  Intra-office international toll


                                 =  Intra-centrex local toll


                                 =  Intra-centrex national toll


                                 =  Intra-centrex international toll


                                 =  Intra-office local toll


                                 =  Customize call-out authority 1


                                 =  Customize call-out authority 2


                                 =  Customize call-out authority 3


                                 =  Customize call-out authority 4


                                 =  Customize call-out authority 7


                                 =  Customize call-out authority 9


                                 =  Customize call-out authority 10


                                 =  Customize call-out authority 11


                                 =  Customize call-out authority 12


                                 =  Customize call-out authority 13


                                 =  Customize call-out authority 14


                                 =  Customize call-out authority 15


                                 =  Customize call-out authority 16


              Call-in authority  =  Intra-office


                                 =  Local


                                 =  Local toll


                                 =  National toll


                                 =  International toll


                                 =  Intra-Centrex


                                 =  Incoming Centrex


                                 =  Intra-office national toll


                                 =  Intra-office international toll


                                 =  Intra-centrex local toll


                                 =  Intra-centrex national toll


                                 =  Intra-centrex international toll


                                 =  Intra-office local toll


                                 =  Customize call-in authority 1


                                 =  Customize call-in authority 2


                                 =  Customize call-in authority 3


                                 =  Customize call-in authority 4


                                 =  Customize call-in authority 5


                                 =  Customize call-in authority 6


                                 =  Customize call-in authority 7


                                 =  Customize call-in authority 8


                                 =  Customize call-in authority 9


                                 =  Customize call-in authority 10


                                 =  Customize call-in authority 11


                                 =  Customize call-in authority 12


                                 =  Customize call-in authority 13


                                 =  Customize call-in authority 14


                                 =  Customize call-in authority 15


                                 =  Customize call-in authority 16


      Call-in Barring Authority  =  NULL


                        K value  =  K0

我只想提取以调出权限=Intra-office开始的块，直到调出禁止权限=NULL

这是我的代码：

begin='             Call-out authority  ='
end='      Call-in Barring Authority  ='

with open("data.txt", "r") as f:
    t = f.read()
    i = t.find(begin)
    j=t.startswith(end)
    print(t[i:j])

data.txt是一个文件

---

谢谢大家

为什么不使用

j=t.find（end）

而不是

j=t.startswith（end）

？Startswith在本例中不起作用，因为

end

字符串的开头可能比您键入的空格多。您可以更好地匹配正则表达式（查看

import re

），但是

find

似乎在这里起作用。

为什么不使用

j=t.find（end）

而不是

j=t.startswith（end）

？Startswith在本例中不起作用，因为

end

字符串的开头可能比您键入的空格多。您可以更好地匹配正则表达式（查看

import re

），但是

find

似乎在这里完成了它的工作。

您只需逐行阅读，直到找到

开始

，然后找到

结束

：

begin='             Call-out authority  ='
end='      Call-in Barring Authority  ='

with open("data.txt", "r") as f:
    for t in f:
        if t.startswith(beg): break
    print t
    for t in f:
        if t.starstwith(end): break
        print t,

---

您只需逐行阅读，直到找到

开始

，然后再找到

结束

：

begin='             Call-out authority  ='
end='      Call-in Barring Authority  ='

with open("data.txt", "r") as f:
    for t in f:
        if t.startswith(beg): break
    print t
    for t in f:
        if t.starstwith(end): break
        print t,