python with 语句

# with 可以在该语句结束后自动关闭
# 且with可以带多个参数

with open("log","w") as fw ,
     open("log1","w") as fw1:
    fw.write("1_linen2_linen3_linen")
    fw1.write("11_linen22_linen33_linen44_line")

with open("log","r") as fr, 
     open("log1", "r") as fr1:
    print(fr.readline())
    print(fr.readline())
    print(fr.readline())
    print("------------------")

    for line in fr1:
        print(line)