day3-3.3文件修改

# Author :Gao ling
"""
#修改
f = open("yesterday2","r",encoding="utf-8")
f_new = open("yesterday2.bak","w",encoding="utf-8")
for line in f:
    if "肆意的快乐等我享受" in line:
        line = line.replace("肆意的快乐等我享受","肆意的快乐等Alex享受")
    f_new.write(line)#一定要和if对齐
f.close()
f_new.close()
"""

"""
#传参替换
import sys
f = open("yesterday2","r",encoding="utf-8")
f_new = open("yesterday2.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)#一定要和if对齐
f.close()
f_new.close()
"""

"""

#with语句，为了避免打开文件后忘记关闭，可以通过管理上下文,
#此种方式，当with代码块执行完毕时，内部会自动关闭并释放文件资源。2.7后，with同时支持对多个文件的上下文的管理
with open('yesterday2','r',encoding="utf-8") as f,\
    open('yesterday2','r',encoding="utf-8") as f2:
    for line in f:
        print(line)

"""

转载于:https://www.cnblogs.com/714070273-ling/p/8251831.html