從文件中複製，直到找到某個標記字符串

Question

我試圖編寫一些代碼，它將打開List1.txt並複製內容，直到看到字符串'John smith'到List2.txt。

這是我到目前爲止有：

F=open('C:\T\list.txt','r').readlines() 
B=open('C:\T\list2.txt','w') 
BB=open('C:\T\list2.txt','r').readlines() 
while BB.readlines() == 'John smith': 
    B.writelines(F) 

這裏是什麼List1.txt可以包含一個例子：

Natly molar 
Jone rock 
marin seena 
shan lra 
John smith 
Barry Bloe 
Sara bloe` 

但是，它似乎並不奏效。我究竟做錯了什麼？

Answer 1

F=open('C:\T\list1.txt','r') 
B=open('C:\T\list2.txt','w') 
for l in F: #for each line in list1.txt 
    if l.strip() == 'John Smith': #l includes newline, so strip it 
     break 
    B.write(l) 

F.close() 
B.close() 

Answer 2

from itertools import takewhile 

with open('List1.txt') as fin, open('List2.txt', 'w') as fout: 
    lines = takewhile(lambda x : x != 'John smith\n', fin) 
    fout.writelines(lines)