python删除“许多"文件中的行 [英] python remove "many" lines from file

问题描述

我正在尝试以

./foo.py filename.txt 4 5 2919

其中4 5和2919是行号

我想做的是:

for i in range(len(sys.argv)):
    if i>1: # Avoiding sys.argv[0,1]
        newlist.append(int(sys.argv[i]))

然后:

count=0

generic_loop{ 
   bar=file.readline()
   count+=1
   if not count in newlist:
      print bar
}

它打印原始文件中的所有行(中间有空格)

it prints all the lines in original file (with blank spaces in between)

推荐答案

您可以尝试执行以下操作:

You can try something like this:

import sys
import os
filename= sys.argv[1]
lines = [int(x) for x in sys.argv[2:]]

#open two files one for reading and one for writing

with open(filename) as f,open("newfile","w") as f2:

#use enumerate to get the line as well as line number, use enumerate(f,1) to start index from 1
    for i,line in enumerate(f):  
        if i not in lines:     #`if i not in lines` is more clear than `if not i in line`
            f2.write(line)   
os.rename("newfile",filename)  #rename the newfile to original one    

请注意，为了生成临时文件，最好使用 tempfile 模块.

Note that for the generation of temporary files it's better to use tempfile module.

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