實現簡單sed替換功能的python腳本

#可以用來修改配置文件參數

 

# -*- coding:utf-8 -*-
import os,sys
old = sys.argv[1]
new = sys.argv[2]
file = sys.argv[3]
file2 = sys.argv[3]
tmp_file ="tmpfile"
f = open(file,"r")
f2 = open(tmp_file,"r+")
for line in f:
    if old in line:
        line= str.replace(line,old,new)
        f2.write(line)
    f2.write(line)
    f2.flush()
f.close()
f2.close()

os.remove(file)
os.rename(tmp_file,file2)

 好用的sed

def sed_file(file_name,old,new):
    f = open(file_name)
    f2 = open("%s.bak"%file_name,"a+")
    for line in f:
        if line.startswith(old):
            line = str.replace(line,old,new)
            f2.write(line)
            f2.flush()
            continue
        f2.write(line)
        f2.flush()

    f.close()
    f2.close()

    os.remove(file_name)
    os.rename("%s.bak"%file_name,file_name)