从文本文件（Python）中删除大块文本

Question

我正在寻找代码解决方案。我需要使用python删除一段文件，这里有5行代码。

Numberplate: BN30CWS 

Time In: Time In: 11:11:3 

Time Out: Time In: 11:11:51 

Speed: Your Speed: 48MPH 

Was this vechile speeding?: No 

（无缝隙）

所以，如果我进入BN30CWS我想那些5行从文件（fileDocStandard）请帮忙删除，我试图做4小时，该工作代码现在，这就是我今天来了，但它只是删除1行，不会删除孔块

def deldata(): 
file = open(fileDocStandard, "r") 
array = [] 
for line in file: 
    array.append(line) 
file.close() 

for i in range(len(array)): 
    print (array[i]) 
let = input("Please enter the plate you want to delete ") 
let = let.upper() 
for i in range(len(array)): 
    arrayitem = array[i] 

    if (arrayitem[0]) == (let): 
     del (array[i]) 
     break 
file = open(fileDocStandard, "w") 
file.close() 
file = open(fileDocStandard, "a") 
for i in range(len(array)): 
    file.write(array[i]) 
file.close() 

任何人看到这个问题，并能帮助我终于完成这个？

Answer 1

您可以阅读您的线条，直到您到达BN30CWS所在的线条。然后使用itertools.islice通过未来5行，写你的线条一个新的文件中：

from itertools import islice 

with open(fileDocStandard) as f,open(newfile) as out: 
    for line in f: 
     if 'BN30CWS' in f: 
      f=islice(f,5,None) 
     out.write(line) 

如果你想覆盖该文件可以使用tempfile：

with tempfile.NamedTemporaryFile(delete=False) as outfile: 
    with open(fileDocStandard) as f: 
     for line in outfile: 
      if 'BN30CWS' in line: 
       outfile=islice(outfile,5,None) 
      out.write(line) 
    os.rename(outfile.name, fileDocStandard)