python_40_通过脚本转换参数实现替换
import sys
f=open('yesterday','r',encoding='utf-8')
f_new=open('yesterday_update','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)#.replace(旧,新) 替换的用法
f_new.write(line)
f.close()
f_new.close()

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