Day13 【小程序】文件修改

文件修改方法：1.加载到内存中修改；2.打开一个文件，修改后写到新文件中

f=open('yesterday','r',encoding='utf-8')

f_new=open('yesterday.bak','w',encoding='utf-8')
find_str=input('Find words:')
replace_str=input('Replace words:')
for line in f:
    if find_str in line:
        line=line.replace(find_str,replace_str)
    f_new.write(line)
f.close()
f_new.close()

 通过脚本传参数的方法

import sys

f=open('yesterday','r',encoding='utf-8')
f_new=open('yesterday.bak','w',encoding='utf-8')

find_str=sys.argv[1]
replace_str=sys.argv[2]
for line in f:
    if find_str in line:
        line=line.replace(find_str,replace_str)
    f_new.write(line)