python读取文本文件中的每一行，并将START和END之间的任何内容放入新文件中

Question

I have a text file i've imported which has no blank lines and looks like this... Each of these things are on a separate line.

--START--some data
one line
two line
three line
--END--
four
five
--START-- some data
six 
seven
eight
--END--
nine 
ten
eleven
--START-- some data

What I want

I have already written code to open the file and loop through each line and find the ones which contain start.

import codecs
file = codecs.open('data.txt', encoding='utf-8').read()
for line in file:

    if '--START--' in line:
    #found the start line (keep all lines until you find END)

What I don't know how to do is create the logic in python where each line that either begins with START or is after that (until but not including the END line) goes into a new text file.

So I would end up with NewFile.txt which contained only:

--START--some data
one line
two line
three line
--START-- some data
six 
seven
eight
--START-- some data

Answer 1

you mean something like

file_contents = open('data.txt',"rb").read()
with open("newfile.txt","wb") as f:
      f.write("--START--".join(p.split("--END--")[0] for p in file_contents.split("--START--")))

Answer 2

What about this?

 import codecs file = codecs.open('data.txt', encoding='utf-8').read() startblock = 0 for line in file: if '--END--' in line: startblock = 0 elif '--START--' in line or startblock: # Write to file startblock = 1 

Answer 3

from  itertools import takewhile
with open("in.txt") as f:
    final = []
    for line in f:
        if line.startswith("--START--"):
            final += [line] + list(takewhile(lambda x: not x.startswith("--END--"),f))
print(final)
['--START--some data\n', 'one line\n', 'two line\n', 'three line\n', '--START-- some data\n', 'six \n', 'seven\n', 'eight\n', '--START-- some data']

To write the new data:

from  itertools import takewhile
with open("in.txt") as f,open("out.txt","w") as f1:
    for line in f:
        if line.startswith("--START--"):
            f1.write(line + "".join(list(takewhile(lambda x: not x.startswith("--END--"),f))))